I've been using one of these for 8 years now and it still works fine. Runs off of D Size batteries.
Ok I manged to find this coleman one on amazon.
its only a single layer one, our current is ~24in high and the extra height is nice - if anyone has a line on one of those I'd appreciate it - but will probably grab the one linked above if nothing else comes of it.
I bought this air mattress a few weeks ago. It requires batteries that you pop in, does not require being plugged into the wall, and has a built-in pump (a little knob on the side). I've only used it for a couple of nights so far, but it's worked out well.