Rhune, have you posted your own ad on Craigslist, or similar, that you are LOOKING for a squeeze? Sometimes that will bring people out of the woodwork that have had something sitting around for awhile and never thought about selling. That has worked for me before.
Craigs says you're not supposed to posted WANTEDs in the FOR SALE sections, but unless you get some real jerk that thinks he/she is the local cop for Craigs, they'll generally leave it alone. Don't put a price -- just what you're looking for. And not all chutes are created equal. Some models will handle critters bigger than others. I could have bought a "needs repair" Powder River chute last year for under $200, but it wasn't originally tough enough for anything much over 1,000 lbs.