S.W.
There used to be a doll store near Lovers & Inwood that bought and sold dolls - used and new. I haven't been there in years, so I don't know if it's still there. I'd try looking in the phone book or online for doll stores and just start calling them. Most likely they'll know somebody.
You might try googling Barbie Doll collectors clubs or fanclubs - they might have a list of area collectors or maybe you can post on a message board. If you're looking to sell them, there's always eBay or craigslist.