Possibly Free STP Products at Walmart

Moms By Heart is reporting that Walmart has STP Fuel Injector & Carburetor Treatment for $1.87 and Gas Treatment for $1.77.


If you use the $2.00/1 coupon here then you can score some for free.


I have not checked the price of these myself so I am unsure what the price is in the Boise area.
Any ideas?

As always prices vary by regions so I would not make a special trip just for these.