Walgreen's by me has the "cannonball" clones. I purchased a few of them for gifts from Brookstones a while back. I paid $20 at Brookstones, and they were 16.99 at Walgreen's about a week ago. They have a "Bit compatible" chassis, but the charging base is separate from the transmitter. Funny, because the transmitter still has a door on it where the charging base should be. Probably some patent thang going on......