I found both of mine on Craigslist here in central Arkansas. They are made in Oklahoma and have a good following with decent forums as well. You can often find better deals on the larger units, especially if they are the 240v. Both of mine have been 110v and worked fine.
This is the current version of my first smaller one.
http://www.cookshack.com/store/Smokers_2/Smokette-Original-Model-SM009-2My second and current is between the 066 and the 160 commercial. Probably close to the FEC100 in size, but it is all electric. Cooked ribs Saturday and two pork butts Sunday, and could not have done it if I would have had to watch a fire both days.
Four butts would max out the smaller one and it was much better with three or less. My larger one will hold about twelve and run well.
http://forum.cookshack.com/eve/forums