Nintendo WII launch christmas...20 came in to Walmart, I got 10, my friend got 10 for ummm...$300 I think? I sold my cheapest one for $450 and the highest went for $600 two days before christmas.
Xbox 360 I only got 5 at two different stores for $400 each. Sold for 500-700 week before christmas.
No PS3 stories...there was too much stock to abuse it. :(