http://www.woot.com/
My wife loves hers, and I bought it for her birthday.
Dyson ball, $279, I got mine from woot 4 or 5 years ago. works great. These deals only last 24 hours, so you have to act quick.
I thought of this thread this morning when I saw that, and it also reminded me to suggest checking out Amazon.com. They have a "Dyson Store" that also offers refurb models, which people have been pretty satisfied with.