Anytime I sell a game account I use playerauctions.com If the characters are not max level you may have harder time selling, but I have sold many through them.
That's not true. I sold a level 50 warlock to a fellow CC coder when HB was first getting started - for $60. Damn fine price for a warlock in greens that took me all of 4 days to bot to level 50.
If the accounts are in Eu try Ebay.de but what a..... recovers accounts and talks about it? I sell mine with ID Copy to prevent such things.... (thanks now I know why the Prices are so low...)