Thumb Score: +12 Amazon [amazon.com] has 1-Gallon Zep High Traffic Carpet Cleaner for $9.77. Shipping is free with Prime or on $35+ orders. Home Depot [homedepot.com] also has1-Gallon Zep High Traffic Carpet Cleaner for $9.77. Price $0.61 lower (6% savings) than the typical price of $10.38