I bought one a few years back from Sportsmans Guide, I believe. It has the air compressor on it as well. Didn't cost more than $50-60 shipped (they're fairly heavy). The air compressor's fairly slow and noisy but works and the jumper's great. Supposed to be able to get several jumps from a single charge. Mine has held it's charge, and I've been surprised that they weren't more popular. They cost about the same as a year's AAA membership and you won't have to wait 3-4 hours for help to arrive. The prices do vary alot, but I'm not sure you get much more for your money by going with the pricier ones.