Pep boys has techron buy one get one free with rebate right now. Autozone has a $3 rebate as well, also Autozone has Gumout Gas milage Improver Free after rebate. Dont know anything about the product but hey its free.... give it a shot on the little womans car.
With my AutoZone rewards card I just buy the free after rebate stuff and after spending $100 that I get back in the form of rebates I get a free %20 Giftcard. And it cost me nothing more than a few stamps and , I get tons of free stuff... like wheel cleaner, air/oil filters, techron and too much more to list.
With all I spend there its the least they can do for me.