Currently for Amazon.com.
http://www.amazon.com/exec/obidos/tg...005795-5115259
Now, this isn't TOO big a deal, since it's limited to just Amazon, for now. And when you think about it, this is the same as paying for a GC and getting a free game for $150, but now you can choose ANY game.
But it is an interesting move. It makes me wonder what kind of deals will be showing up as Christmas nears. It might not be too farfetched to see a GC with a GBA player and game for $100 soon.