Here is the link to Affordable Power,
http://stores.ebay.com/AFFORDABLE-POWERWord of warning these are used generators that have not been rebuilt. Tested, serviced, and painted is what the website says.
And as rabagley suggests don't by a cheap gas generator. I would recommend a Yamaha or Honda, real Honda, not just a generator that has a honda motor on it. If you want to step up from there go for one of the engine driven welder/generators. The most well known being a Lincoln or Miller.
http://www.mylincolnelectric.com/Catalog/equipmentseries.asp?browse=101|400|
http://www.millerwelds.com/products/enginedriven/If you know how to weld you could even make a little extra money with one of these. The welder generators have a higher resale value, and are also available in diesel.
If you want to see what generators in your area hold up the best go to a couple of tool rental companies and see what brands they rent, if it holds up to rental use and abuse it will last you a very long time. Tool rental companies are a spare parts source too, and if you have the same brand you will have greater options of where to get something when you really need it.