Sticky, I'm sorry for hi jacking your thread. There are places you can get foam for a reasonable price. I bought one of those gel pads and messed around with it and found it to be uncomfortable, imho. Maybe you can figure out a way to get an inner tube in the seat.
Ken, I guess so and thanks!
Bobby, those are just inner tubes. I get most of them at a tire joint down the road from me. The smaller one, like in the pic, I get from Razorama. It's the size that's used in their electric scooters.