There are a couple of high value STP products and Armor All products coupons available. You can use these coupons at Target and Walmart to get the following deals:
At Walmart
STP fuel injector & carburetor treatments $1.87 and gas treatments for $1.77. Use $2/1 coupon to get them free.
At Target
STP products $2.49. Use $2/1 coupon to pay 0.49 each.
Armor All products as low as $2.49-2.69. Use $2/1 coupon +$3/2 Target printable to get them FREE.
Thanks Money Saving Madness and Money Saving Mom!