Autozone... Just used it today and used my rewards points on top of it.
Picked up a 5-qt jug of synthetic, a Mobil 1 extended performance oil filter, a Fram air filter, and some fuel system cleaner for $35 after my $10 off coupon and my $20 in rewards points
Hope someone else can use a few bucks off too! Just print it out and bring it in! Expires 9/24/11.