I use 5 inch hi-density foam work perfect time after time don't need air or pump kids always used it at my home for sleep over. I made a plastic Cover for more protection bu u can used just small tarp work perfect.
About the cost of the foam $ 40-60 depend of the upholstery supply store
my parents always had that stuff when i was a kid and we went camping, but i never knew where i could get it! now i know though... i might have to go check that out now! good idea!
