I've also got the Suprema Sport. It's a good, cheap, basic 35mm camera. I think you can find it for ~$45 if you shop around.
Also, some types of disposable underwater cameras can be reloaded & reused, if you're careful taking them apart. The one I used to have looked like the little cheap black disposable cameras that they sell everywhere, inside of a hard, clear plastic rectangular case. It cost about $20. It had a flash, but you had to advance the film manually after each shot. And they wind backwards - you "unwind" a new roll before use (with a pick and a screwdriver), and the film rewinds itself back into the roll one picture at a time as you use it. On the package it said it was only good to 15 feet, but I had no problem until ~70 feet, when the outer case squeezed-in and I couldn't advance the film. But it didn't leak or anything. One day I broke it & threw it away. I'm not sure what brand it was or where they sell this type of camera around here (I bought that one at a Kiosk in Cozumel).
I haven't had any luck trying to reload the blue Kodak underwater disposable cameras that they sell at places like Wal-Mart. I'd probably buy another one of those black & clear disposables if I could find one.