Michelle, from Money Saving Madness found the following STP products at Walmart– they’ll be free after the new printable coupon for “liking” STP on facebook!  Now if only I knew what to do with this stuff once I’ve bought it for free.

STP Fuel Injector & Carburetor Treatment $1.87
$2.00/1 – STP Product – (facebook.com)
Final Price: Free

STP Gas Treatment $1.77
$2.00/1 – STP Product – (facebook.com)
Final Price: Free