Picked mine up this afternoon without much trouble. The biggest Geo store in my area was sold out but another local hobby store had five or six of them in stock.
I live in the sticks though. No idea what the stock in big cities is like.
Not had a chance to give it a proper go but it's a nice wee device. Played through the first four stages of SMB and had no problem with the cable length which was a big concern for many. The size of the controllers may be a problem for those of you with big hands though as they are absolutely tiny.
Took some pics before I hooked it up.