You're in SC?
www.carolinashootersclub.com I used to mod there until it was sold to a left coast media company a year ago. 20,000 members, and there is a tone of classified activity there. In fact, that's about all it is now. It's not nearly as closely moderated as it used to be, but better than armslist.
When it was sold, about 1500 of the top posters and moderators set up www.carolinafirearmsforum.com and there is an active classified section there now. It is more closely moderated
Do you know the name of the company that bought it?