Check out craigslist.com
It's more for local advertisement but I know lots of musicians that have used it for buying/selling instruments in the Seattle area, so maybe it will work for yours as well.
If you are close to a big city, go scour the pawn shops. I found a late 80's/early 90's neck-thru Charvel with the FR licensed Kahler Spyder, EMG (I am assuming an 81) in the bridge and all locking nuts etc. at a local pawn shop. It even had the mop shark fin inlays in the fretboard. They were asking $250. Stupid me.... I didn't buy it. That was a guitar that costed well over $1000 new.