The Sphero BB-8 is $48 at Gamestop right now. Starting on 9/1 it'll be BOGO. So you can get two for $48, making them $24 each. Now that's the lowest price I've seen for BB-8s.
Beware that these will be Gamestop "new". If you buy from Gamestop, you'll know what I mean. To the rest of you, they will likely be open box. So if you are a serious collector, this isn't for you. If you always wanted a little BB-8 to watch TFA with you, this is for you. To those who don't know, the Sphero BB-8 will watch TFA with you and respond accordingly at certain points of the movie.