If you own a size 8 Oura Ring, purchase a size 8 charger. Thankfully, there is no premium for larger chargers. All Oura Ring charging docks cost $59 at the company’s official store.

Customers can buy a Gold, Silver, or Black ring in sizes 4 to 15. The other finishes, including Brushed Silver, Stealth, and Rose Gold, are unavailable at Costco, but can be bought on Oura's ...