Can’t endorse this sale as I have never attended, but it certainly sounds promising.  May just be worth a trip to Charlotte.  You can shop while you’re there, or if you just want to sell your stuff you can drop it off and come back later to pick up your proceeds.  According to the site, you do not need to stay with your stuff!  Check out the link for more details.

Equestrian Exchange Tack and Consignment Sale – Charlotte, NC – Feb 24-25, 2012