Auto has the coupon code ENCORE good for $50 back on a purchase of $100 or more starting 9/15/10. Now, its $50 back. It may not be $50 off, we will need to wait until 9/15 to see. Last time it was get a $50 coupon code to spend later. That $50 code could not be used with other coupon codes.
Other current codes may be bettter depending on your use:
P20 takes 20% off no minimum purchase
BIG25 takes $25.00 off purchases of $60.00 or more
BIG30 takes $30.00 off purchases of $75.00 or more
BIG40 takes $40.00 off purchases of $100.00 or more
BIG50 takes $50.00 off purchases of $200.00 or more