The Minneapolis Craigslist is full of great boxes. Here is a box that retails for over $7600 that he is asking $2500 for. I bet he would even throw in the side box he has with the sale if a person showed him some cash.
http://minneapolis.craigslist.org/tls/1170628545.html
I'm sure if a person did their homework (like I'm sure you will, Chuck) there probably are some decent off brand boxes out there. Keep your eye on Craigslist though.