If you go to the Microsoft Store, you can get 2 different Windows Phone's 7 devices for just 1 cent AND that goes for upgrades! Amazon wants $99 and you get 4000 Xbox points. Probably for Fathers Day only, but just ordered my HTC Arrive loving the 1 cent charge!
I picked up a Trophy a few days ago on that deal from a Microsoft store (my Focus had to go back due to AT&T coverage issues). I don't know how long it is going for, but it started about a week or so ago. Definitely a great deal just for the phones alone, let alone the 4000 MS points on top of it.
If you want a WP7 and don't mind switching carriers this is a no brainer. If you're switching to Sprint it's even sweeter because they mostly pay for your ETF (limited time $125). I jumped on this as well as a friend.