Depends, does it work? What kinda shape is it in? Does it have the endcaps (most never do //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif ) and the crossover module?
If its in really good shape, with the endcaps, and the module, I'd say anywhere from 70-100 on ebay.
Anything less and I'd say start at 50, assuming of course that it works and all.
Or ya could just keep it and use it for mids...or even a single 10 or something. They are nice amps! //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif