It appears that this deal varies a bit depending on your region, so be sure to enter your zip code to see what you are eligible for
Also noticed that the sale ends Sat 9/3 for some areas, but for me here in GA it ends Tues 9/6.... YMMV

All Areas? thru 9/3
$125 back on set of 4 "Best" tires (a bit less for "better" or "good" tires)
$125 back on set of 4 "Best" wheel/rims(a bit less for "better" or "good" wheels)
$60 back on set of 4 tires using new DT credit card
$60 back on set of 4 wheels using new DT credit card

My best deal was on a set of 4 Vogue tires, 20-inch, only $75 back in Visa GC, but still beat Costco and everyone else by over $100 out the door

http://www.discounttire.com/dtcs/findPromoTireSection.do