You could get a bike innertube and sacrifice it to the pool gods (not Gods, damn them!).
Get the 26 x 1.5-2.2 size. Make your 1st cut 1/2" to the side of the valve and you could pobably get 3 or 4 of 'em. You can give them to your family as gifts...LOL!
Pay no more than 3.99!
-piga