You may want to try here,
http://www.treadepot.com/groupdetail.html
They are the cheapest I've found, though shipping was a little more than Tirerack. Overall saved about $40 for a rear set
OT: UPS rant.
UPS mistakenly shipped 1 tire to the tire store down the street last friday (My shipping label was for (2) packages, I only got 1 of 2. I call that day, was told by the UPS rep. someone would be on it, yadda yadda... Tracking shows it was signed for and delivered less than 1 mile away. I could have probably straightened out the mix up personally, but felt UPS should make it right instead of making me do the run around. Well SIX whole days later, and at least 5 phone calls the tire finally arrived to join it's twin TODAY. Sheesh! UPS runs a tight ship my arse.