Guildman:
I've seen them in that same range Dane cites. Having done this once, I think 475 to 500 is the target range for improved, excellent condition versions. By improved, meaning new pots, caps, jack, switch, properly set up.
My M75T came to me for 350, in near new original condition. It's been more than improved, now with the above changes plus a new nut, treble bleed mod on the neck p/u, new frets and Gretsch hardshell case. Before I came to my senses, I had been offering this one for trade at 500. Luckily no one realized this guitar was as good as described, so I still have it. Point is, if you can find one significantly upgraded, you're better off. The electronics are the weak point on IMO. Also on the T model, the nut caused no end of tuning problems. (New tuners is not something you should need here.) I can't generalize from my fret job experience with this M75T. Every other dearmond I've owned had excellent frets. Hopefully you'll find one like that.
MD