Intex Full 8.75" Prestige Downy Airbed Mattress with Battery Pump on Clearance at Walmart. YMMV and in-store only. There seem to be plenty in stock at Walmarts in the Ohio valley. 4 out of 5 star reviews. Almost disposable at this price.
http://www.walmart.com/ip/Intex-F…p/26957923
Brickseek
Full $9 https://brickseek.com/walmart-inv…u=2695792
Queen $13: https://brickseek.com/walmart-inv…u=2044935