While it's not inflatable, Crate has come out with the next best thing ... the Powerblock. A VERY small amp, think about 3 VHS tapes, delivering 75 watts per channel stereo or 150 mono. And it actually sounds fairly decent! I bought one to use as a back up (around $200). My biggest complaint is no reverb, but it does have an effects loop, so I wire in my old Alesis mini nanoverb, (about the size of 1/2 a VHS tape). The Powerblock also has RCA ins to attach a CD player, mp3 player, or other device for jamming along. Now all I need is a high quality miniature speaker cab! LOL
Bill, tgo