Site is: http://www.furbuy.com/
Beta site is: http://www.furbuy.com/classifieds/
Maybe you've seen it? Fursuits, art, books, toys, commissions, anything furry-related can be sold here!
I've used it for a few of my items before, I always thought it had great potential! Now, it has opened in Beta mode!!
It features: comment notification system, messaging, open forums, etc!
DUDE. This may be a Godsend after the FA exodus for all artists who don't want to support FA, but still want to generate commissions and sales! Of course, it's only in Beta-testing [like Weasyl, of course], but this could be HUGE if enough people support it!!!
I used to be a bit wary of Furbuy because it did not have very many useful features and was pretty buggy, but if it turns this corner, I may nestle myself in there and become a very permanent supporting member!