Anyone familiar with a Audiogon-like site for A/V?


Have been looking for a site where dealers and private sellers sell A/V equip. ...Specifically televisions and television stands/yoke wall and ceiling mount brackets. I would like to purchase a Bretford ceiling mount, but the folks I've spoken with (to date) want as much $ as I paid for my television! ...These guys have got to get real. ...How can a metal frame be valued as much as a TV?