Well, as more info has come out, it appears MS is claiming this is a limited price drop. They didn't specify the end, but said it wasn't permanent.
Guess we'll see....
well, it must have already ended because I had to pay $49.99 for mine yesterday at Best Buy. But I did get my wireless adaptor for $20 less than I was anticipating, so all in all, I came out $10 ahead of where I figured I would.
