You can do consignment such as luxury-shops.com or yoogiscloset.com Also craigslist.org... you usually make a lot less with consignment as you get only 50-70% of the selling cost. Or advertise to your friends hehe.
It is hard right now; I have 2 or 3 b-bags that I would like to sell, but am waiting until things pick up. I even have a rare, mint bag that is priced below the majority of B-bags on Ebay but have just been receiving low ball offers.
Try AFF's. If you tell them how much you want for the bag, they can list it and price it accordingly. For some reason, bags fly off her site, while Ebay bags sit for a long time.