eBay.com has the Bissell SpotClean Portable Carpet Cleaner model #5207A for $44.99 with free shipping. List has it as regular price $86, lowest on Google I found is $80.
From the listing :
-Deep Reach Tool removes embedded dirt and stains from the bottom up
-Heatwave Technology® helps maintain constant water temperature throughout the cleaning process
-Permanently removes spots and stains from fibers in carpets, rugs, and upholstery
-Removable water tanks for easy filling and emptying
-Slim design is easy to carry and fits conveniently on a stair