Where can I find a plain silicone sports Apple Watch band

I'm frustrated. Sorry to vent. I just bought an Apple Watch that I love. I really wanted an Apple Watch because I have an Apple Phone. I knew the band it came with wouldn't fit. It was 8 inches long, and my wrist is 9 inches long. I found some after-market bands I liked pretty well, the only problem is these bands are configured in such a way that they disable the sensor. What I'm looking for is a plain silicone sports band that usually costs less than $20 in my size. My clock case is 40 mm.

I waited on Apple's chat to speak with a specialist for about an hour.

I'd sure appreciate any help you might have.

Thank you.

[Re-Titled by Moderator]