It looks like Target will have it first, then TRU, but WalMart is the cheapest. $30 for the battery, though. I've got plenty of 7.4v LiPo's, but I bet it will need a special connector.

Is the F-16 Falcon any good?

Another one of my AA's is way up in a tree. I modified this one by mating the bottom wings to the top ones. Just mounted them under the tips of the top wings with about 1/2" overlap and held on with tape. It flew GREAT for the few days I had it this way. Smooth, but could really get some cool stunts in the wind. This one is in a pine tree, so even winter won't bring it down.