In my travels, i've come across 2 Tektronix scopes on Craigslist and was lucky enough to pick them up for a song. The first for $75 and the second for free!
The first one is a Tek 465M model which was ruggedized for military purposes.
The second is a Tektronix 7704A scope that I picked up (Ugh) for free. It has a problem with the power supply which should be fun to track down and fix!