The 1-ounce platinum bar sells for $1,090. Sales of gold bars on Costco's website have previously sold out in minutes.

Costco is trying to replicate its recent success with gold bars, with platinum joining the extensive list of precious metals that collectors are snapping up at the retailer. In 20

Costco is expanding its precious metals offerings, building on top of its rollout last year of gold bars, which often sold out within hours. The retailer is now adding 1-ounce platinum bars to its lineup.

Costco's platinum bars are selling for $1,089.99 each, slightly more than its press time value of around $1,000 per ounce. Related: Costco Is Now Selling $625 Packs of Silver Coin

Costco on Wednesday announced the 1-ounce platinum bars, on sale for $1,089.99 on its website alongside its now-famed gold bars and silver coins.

The Swiss-made platinum bar is being offered for sale at $1,089.99 only to Costco members, who are limited to five units.

Costco expands its precious metals lineup, offering 1-ounce platinum bars and Maple Leaf coins for $1,089.99 online, following the success of its gold bars and tapping into rising platinum demand.

After recently announcing that its customers are buying more gold, Costco also appears to be selling Swiss-made platinum bars. The company was reportedly selling the 1-ounce platinum bars for $1,089.99 on its website on Wednesday.