Mine came from Sam's Club. About four years ago. My local Sam's now has an Aluminum one for more money, but It's definitely nicer. It's very similar to the ones that are sold at Sears. I've seen the same jack at Pep Boys, and another similar one at Harbor Freight.
Actually I don't use the Jack very often, but when both wheels need to come off it's a necessity. So I figure for the amount of use it sees the inexpensive one is good enough for me.
http://homepage.mac.com/dennyhenderson/PhotoAlbum4.html