I found a subscription-free smart ring that rivals Oura - and it's discounted at Walmart

Select sizes of the Ultrahuman Ring Air are on sale at Walmart. The smart ring is a comprehensive sleep and activity tracker with features that rival Oura.

• The Ultrahuman Ring Air is the brand's first foray into the smart ring space, and it's available for $349 (though select sizes and finishes are discounted right now at Walmart), no subscription required
• The ring is great for hardcore fitness enthusiasts and recreational exercisers looking to use their health data to optimize their wellness routines
• The app's user interface could be improved for easier access to daily logging functions.