Where can I buy a plain ordinary inexpensive tire tube to float down the river on?

Question

I'm not looking for a fancy river tube that costs $99+. I'm looking for just a plain ordinary cheap tire tube. Even a used one would be okay, so long as it floats.

Answer 1

Check a tire shop that services big trucks. They will usually have used tubes they may give to you for free. A new one shouldn't cost too much.

Answer 2

Tire shops - easy!   Especially tire shops that do retreads.   We used to get them all the time for like $5 - $10 each.