Amazon offers the BlueMagic 900 Carpet Stain & Spot Lifter 22-oz. Can for $3.24. Add it to your cart via Subscribe & Save to drop it to $2.75 with free shipping. That's about 50 cents under our mention from last June and the best price we've seen. (It's also a current low by $6.) It purports to lift both oil and water based stains and spots.

Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.