I was just about to mention that -- and that sale has been going on for several weeks, actually.
Guess I will have to make a habit of always checking Staples first when I need a mouse!Edit
: Regarding the scroll wheel -- although the 325's wheel has detents, they are very light and much more closely spaced than on most scroll wheels. I think the wheel may also be weighted. Give it one good flick with your middle finger and it will spin enough to scroll all the way to the bottom of a full page of the dymt thread!