https://www.amazon.com/Lerobo-Compatible-Samsung-Galaxy-Silicone/dp/B09K3X7DFN/ref=mp_s_a_1_5?crid=3N7P8HAIP3TOY&keywords=silicone+20mm+watch+band+small&qid=1657542489&sprefix=silicone+20mm+watch+band+small%2Caps%2C61&sr=8-5

I'm not sure if you like the style but these are a very breathable design and this brand offers cheap multipacks along with small/large options.