Saw this deal on slickdeals. I got a set of WS70 225/45/17 for $360 with taxes.
http://www.firestonecompleteautocare...sp?id=10000394
I went in with the printed coupon and then they verified it online. Basically select shop by tire size, enter zip, sizes and search. Under the winter tires results there's a red link for this buy 2 get 2 deal!