go ahead and add www.newandusedvolvoparts.com to that list, as well as www.gapa.com.
It's not the software, it's the whole service. It's like one central auto parts mega-warehouse, that people pay a small fee each month to get wholesale parts, use their software on their company's URL, and basically get commission. The amount of cash you get is dependent on how many people buy your things. You set pricing if you want, and then do the marketing. I looked into it a while back, but there's MANY more places to get better parts (the warehouses are good if you're in a jam and need a cheap part fast) for comparable prices.

Ryan