I wouldn't give up on Craig's List. A lot of kids only play seasonally (like mine) and by the time the next season comes around they don't fit and they wind up being very gently worn. I have not bothered to sell mine as I always buy off season and have never paid more then $5 (some as low as $1.50 new!), so I usually just pass them on to a friend. Anyway, it might be worth a try.
Oh, and for the future, check out places like Target off season, that's where my best deal have come from!