My LDS has a fancy display where they sell the QALO silicone rings for about $10. We got them for international trips where we were concerned about the possibility of getting mugged in addition to the possibility of losing a ring on a dive or attracting a critter. They're comfy, and perform their intended function well enough.It is amazing the number of people I see, including myself, wearing silicone rings, from cheap 6 colors for 10 dollars on Amazon to 30 and 40 dollar rings.
Silicone Rings & Silicone Wedding Bands | QALO
Enso Silicone Rings and Silicone Wedding Bands - Lifetime Guarantee!
These are two of the more popular but also pricer silicone ring options.