The question to ask yourself is do you actually need one? The Oura Ring 4 is a fully round ring designed to be worn on the index finger for the most accurate readings, though you can also wear it ...
In the Oura Ring January sale, the Oura Ring 3 starts at £249 on the Oura Ring website. However, they normally start at £349, depending on what colour you choose.
Right now our top pick is the Samsung Galaxy Ring, which just pips the Oura Ring 4 thanks to the fact it doesn't require a subscription to use. But if that's not your cup of tea there are plenty ...