Costco now sells a 1 oz silver bar under its own Kirkland Signature brand. The bar is minted by Sunshine Minting, sold exclusively through Costco’s website in 5-packs, and contains .9999 fine silver. It is the first private-label bullion product from a mainstream retailer. Below is what we know about the bar so far: who makes it, what it costs, and how the bullion premium compares to 1 oz silver bars from online dealers.
What Is the Kirkland Signature Silver Bar?
The Kirkland Signature Silver Bar is a 1 troy ounce minted bar containing .9999 fine silver (99.99% pure). Four-nines purity is higher than the .999 standard used in most generic silver bars and American Silver Eagles. It matches PAMP Suisse, Royal Canadian Mint, and Valcambi products.
Each bar ships in a tamper-evident Kirkland Signature branded assay card that certifies the weight and purity. The back of the bar carries an individual serial number, weight and purity markings, and a central circular mint mark.
| Specification | Detail |
|---|---|
| Weight | 1 troy oz (31.103 grams) |
| Purity | .9999 fine silver |
| Dimensions | 50 mm x 29 mm |
| Finish | Proof-like |
| Packaging | Individual Kirkland Signature branded assay card |
| Serialized | Yes, individual serial number |
| Manufacturer | Sunshine Minting (Coeur d’Alene, Idaho) |
| Sold by | Costco (online only, members only) |
Who Makes the Kirkland Signature Silver Bar?
Sunshine Minting produces the bars. Sunshine operates out of Coeur d’Alene, Idaho, and supplies the silver and gold blanks the United States Mint uses to strike American Silver Eagles and American Gold Eagles. Sunshine’s retail products include the MintMark SI anti-counterfeit feature, a micro-engraved security element built into the bar’s surface that can be verified with a decoder lens.
Costco does not prominently list the manufacturer on the product page. That follows the standard Kirkland Signature model: the brand is Kirkland, the production is Sunshine. Same arrangement Costco uses for everything from vodka to batteries.
Design Details
The front of the bar has the “KIRKLAND Signature” logo centered on a matte silver field, framed by a repeating micro-inscribed border reading “KIRKLAND SIGNATURE.” The reverse carries the weight and purity markings, a central circular mint mark, and the individual serial number near the bottom edge. The look is plain and corporate, not ornamental.
The proof-like finish gives the bar a reflective surface, shinier than a standard minted bar but short of the deep mirror proof finish on premium collectible pieces.
How Much Does the Kirkland Silver Bar Cost?
Costco sells the Kirkland Signature Silver Bar in 5-packs. At launch in September 2026, the 5-pack listed at $349.99 when the silver spot price was near $63 per ounce, working out to roughly $70 per bar, or about an 11% premium over spot. When silver traded near $69 per ounce in late August, the 5-pack was listed around $369.99, putting the per-bar cost near $74 (approximately a 7% premium).
The premium fluctuates with the silver spot price, but it consistently runs in the 7-11% range. That is higher than what most online bullion dealers charge for a generic 1 oz silver bar (typically 4-8% over spot depending on the dealer and quantity), but it comes with the Costco rewards stack and the Kirkland brand recognition.
Kirkland Silver Bar Premium vs Online Bullion Dealers
Here is how the Kirkland bar’s cost compares to typical 1 oz silver bar bullion prices from online dealers at a silver spot price near $65 per ounce.
| Product | Approximate Price | Premium Over Spot |
|---|---|---|
| Generic 1 oz silver bar (online dealer, wire price) | $68 – $70 | 5-8% |
| Sunshine Mint 1 oz bar (online dealer, wire price) | $69 – $72 | 6-11% |
| Kirkland Signature 1 oz bar (Costco, 5-pack) | $70 – $74 | 7-11% |
| PAMP Suisse 1 oz bar (online dealer, wire price) | $72 – $78 | 11-20% |
The Kirkland bar lands in the same premium range as a Sunshine Mint bar from an online bullion dealer, which makes sense: it is a Sunshine Mint bar with Kirkland branding. The difference is that Costco members who pay with the Costco Anywhere Visa by Citi earn 2% cash back, and Executive members earn an additional 2% reward, reducing the net premium by up to 4 percentage points. After rewards, the Kirkland bar can match or beat online bullion dealer pricing for branded 1 oz silver bars.
For a full breakdown of how the Costco rewards math works on precious metals purchases, see our Costco gold rewards and credit card membership math guide. The same reward structure applies to silver.
How to Buy Kirkland Silver Bars at Costco
The Kirkland Signature Silver Bar is sold exclusively through Costco’s website. It is not available in warehouses. You need an active Costco membership to purchase, and the product page appears under the precious metals section of costco.com.
A few things that trip up first-time Costco bullion buyers:
- Online only. Precious metals never appear on the warehouse floor.
- Purchase limits. The 5-pack is limited to 1 transaction per membership and a maximum of 5 units per 24 hours. There is also an 8-unit-per-day cap across all precious metals orders per address.
- No returns. All precious metals purchases at Costco are final sale and non-refundable. This is one of the few exceptions to Costco’s satisfaction guarantee.
- Signature required. Shipments require an adult signature (21+) on delivery. A valid U.S. government-issued ID may also be required.
- Sells out fast. Restocks tend to disappear within hours.
Why This Matters for the Silver Market
Until now, every precious metal Costco sold carried a third-party brand. The 1 oz PAMP Suisse gold bars that launched in September 2023, the silver coins and PAMP silver bars that followed in early 2024: all manufactured and branded by someone else, with Costco acting as the retailer. The Kirkland bar changes that. It is Costco’s own product, manufactured to their specifications by Sunshine Minting.
That is the same approach Costco uses across hundreds of Kirkland Signature categories: find a quality manufacturer, brand it Kirkland, and undercut the name-brand price. Kirkland Signature generates roughly a third of Costco’s total revenue. Putting the label on a bullion product suggests precious metals are a permanent part of the lineup, not a promotional experiment.
For more on how Costco’s precious metals lineup has evolved, see our Costco bullion lineup expansion coverage.
The Sales Tax Factor
Sales tax is easy to overlook. Many states exempt bullion purchases, but some apply the exemption only above a minimum purchase threshold. A 5-pack of 1 oz silver bars at $350 to $370 can fall below those thresholds in states where a $500 or $1,000 minimum applies, meaning you pay full sales tax on the purchase.
At 5-9% sales tax rates, the tax alone can exceed the dealer premium. In states with high exemption thresholds, buying silver at Costco may cost more than buying from an online dealer even after the rewards. Check your state’s bullion sales tax rules before purchasing.
Secondary Market Value
The Kirkland bar has already shown up on eBay, Whatnot, and established bullion dealers like Bullion Exchanges. Early secondary market bullion prices are running well above both the Costco retail price and comparable generic silver bars. The novelty of a Kirkland-branded bullion product is driving most of that premium.
Whether that holds depends on supply. If restocks stay limited, the secondary premium may stick. If Costco ramps production the way it does with most Kirkland products, the novelty premium will compress toward the price of a standard Sunshine Mint bar. For buyers focused on the lowest cost per ounce, generic 1 oz silver bars from online dealers are still the cheaper option. The Kirkland bar suits buyers who want the brand association or who are already placing a Costco order and want to add silver to it.
How the Kirkland Bar Compares to Costco’s Other Silver Products
Costco sells several silver products. Here is how they compare.
| Product | Size | Purity | Approximate Premium | Format |
|---|---|---|---|---|
| Kirkland Signature Silver Bar (5-pack) | 1 oz | .9999 | 7-11% | Minted, assay card |
| PAMP Suisse Silver Bar (20-count tube) | 1 oz | .999 | Mid-single digits | Minted, tube |
| PAMP or ABC Cast Silver Bar | 10 oz | .999 | Low single digits | Cast, no assay |
| PAMP or ABC Cast Silver Bar | 100 oz | .999 | Near spot | Cast, no assay |
The Kirkland bar carries the highest per-ounce premium of the bunch, as 1 oz bars always do. Buyers who want to minimize premium per ounce should look at the 10 oz and 100 oz options. The Kirkland bar’s edge is the .9999 purity, serialized assay packaging, and the Kirkland brand itself.
For a broader look at what silver products Costco stocks and how availability works, see our Costco silver coin availability guide.
Should You Buy the Kirkland Signature Silver Bar?
The Kirkland bar makes the most sense for Costco Executive members in states with no sales tax on bullion, paying with the Costco Anywhere Visa. With the 4% rewards stack, the effective net premium drops into the 3-7% range, which is competitive with online bullion dealers for a branded, serialized, .9999 fine bar.
It makes less sense if you are joining Costco specifically to buy silver. A $65 membership fee on a $350 to $370 purchase adds 17-18% to your effective cost, wiping out any premium advantage. And if your state taxes silver bullion, the tax can exceed the premium you would pay at an online dealer.
For buyers focused purely on accumulating silver at the lowest premium over spot, the silver closest to spot page ranks every product across online dealers by premium. For those interested in Costco’s gold offerings and how the rewards math works there, see our Costco gold bar price comparison.
Frequently Asked Questions
Who manufactures the Kirkland Signature Silver Bar?
Sunshine Minting, based in Coeur d’Alene, Idaho. Sunshine is one of the largest private mints in the U.S. and supplies blanks to the United States Mint for American Silver Eagle and American Gold Eagle production.
Is the Kirkland silver bar .999 or .9999 pure?
It is .9999 fine silver (99.99% pure), higher than the .999 standard used in most generic silver bars and American Silver Eagles.
Can you buy Kirkland silver bars in a Costco warehouse?
No. All Costco precious metals, including the Kirkland silver bars, are sold exclusively online at costco.com. They are not available in physical warehouse locations.
Can you return Costco silver bars?
No. Precious metals are one of the few product categories exempt from Costco’s satisfaction guarantee. All silver bar purchases are final sale and non-refundable.
How many Kirkland silver bars can you buy at once?
Costco limits the 5-pack to 1 transaction per membership with a maximum of 5 units per 24 hours. There is also an 8-unit-per-day cap across all precious metals orders per delivery address.
Are Kirkland silver bars a good investment?
The Kirkland bar contains 1 oz of .9999 fine silver and tracks the silver spot price like any other bullion product. For existing Costco members who use the rewards structure, the effective cost is competitive with online bullion dealers. For buyers focused on the lowest possible premium per ounce, larger bars and generic products from online dealers typically cost less. This is not investment advice.
Silver bar bullion prices referenced in this article are approximate and based on market conditions at the time of writing (September 2026). Prices change throughout the trading day. FindBullionPrices is not a dealer and does not sell silver bars directly. Always verify the final price, shipping costs, tax implications, and dealer reputation before completing a purchase. This content does not constitute investment advice.
