Why would any of the PC types need one of these, for that price we've been able to get much better mice for a while:
http://www.bestbuy.com/site/olspage.jsp?skuId=7105919&type=product&productCategoryId=pcmcat23200050023&id=1109233585993
That having been said, the Scroll Ball is an interesting concept, but like I said, whether it works remains to be seen.
Forget Best Buy, you can get the best deal on a mouse on Ebay. I paid $6.00 plus $5.00 shipping on a logitec track ball mouse. They sell for $40 plus at Best Buy.
And on my Mac at work, I have a logitec mouse - the other buttons don't work on it but it works much better and is much easier on my hand than the apple mouse.