Amazon has the 1-Gallon Rocco & Roxie Stain & Odor Eliminator for Strong Pet Odors on sale for $37 - 5% off with Subscribe & Save (can cancel anytime) - 25% off (check “Save an extra” box, eligible on first S&S order for this product) = $26 with free shipping. Roughly 26 cents per ounce. The 32oz spray bottle is also on sale for $14 after S&S.

• Amazon reviewers like this for eliminating the stink of cat urine.