@Audiolabyrinth, I don't know how long this will stay up, as these boards are moderated, but I have found Audio Asylum Trader, US Audiomart and it's sister CanuckAudiomart, Sound Offers and Ebay to be a few other alternatives for buying.
I currently have stuff for sale on Audio Asylum Trader and US Audiomart. Like I said, the volume isn't as high, so if you are in a rush to sell, Audiogon is still the best option for a quick sale.