There are some reports on the macrumors forum with pictures about bumpers being for sale at walmart. Just thought you guys should know. I can confirm as there were some at my local walmart which i promptly bought up . They had black and white I just bought the white ones.
Link to thread on macrumors
FYI: Walmart now sells Apple bumpers - Mac Forums
Link to thread on macrumors
FYI: Walmart now sells Apple bumpers - Mac Forums