Update: This has risen slightly to $14.52. Still a great deal!
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Wenzel Camp-Away Airbed with Comfort Adjust Pump – Link 
Amazon has got this currently marked down to a record low of only $10.95!
- Inflatable twin mattress with built-in hand pump for quick inflation
- Comfort Adjust pump lets you customize the firmness
- Inflates in about 90 seconds and deflates just as quickly
- Flocked top keeps bedding in place.
- Measures 74 inches x 39 inches x 9 inches (LxWxH)
- Location, temperature, and humidity will affect the firmness of the airbed. Airbeds will need to be occasionally re-inflated (topped off) to maintain desired firmness upon initial use and when used for more than a few days as material tends to relax over time.