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Amazon [amazon.com] has 1-Gallon Zep High Traffic Carpet Cleaner on sale for $ 10.49. Shipping is free w/ Prime or on $ 35+.

Product Description from Amazon[list][*]Lifts food and dirt stains[*]Enzyme action eliminates odors[*]For high-traffic areas; revives matted, old and soiled patches[*]Removes deep, set-in stains[*]No need for dilution – Ready to use – Just spray and blot