I love those things. I did a test booth on them in a flea market recently and people were coming from all over the building to see what they were. They are a seriously "tangible" sell; anyone who gets his hands on one pretty much will buy it if he has the money onhand. They're so much fun that it's stupid. The order turnaround sucks, since it will be all but impossible to get them for Christmas, but AirSwimmers are awesome and I would think would do well in any kind of context where people can see them in person -- mall kiosks, flea markets, events, even out in a public park if you can get some kind of vendor licence (who knows, you could probably put six in the trunk of your car, fly one around a Wal-Mart parking lot and sell a couple for cash.)
From a sales perspective they remind me of Link hidden: Login to view puppets, which I literally used to just wander around flea markets playing with and selling them like crazy, when my wife and I were big into the Atlanta flea market business.