O'Reilly's has the valvoline rebates for 3.99 each, up to 12 quarts for the full synthetic @ 5.49. Also, their syn-blend works out to 1.00 qt. if anybody is interested.
Followup: Wamart has full syn for 4.97 which brings it down to 98 cents per quart. You just gotta get the rebate form from oreilly's.
I think I'll start using this in my lawnmower.