The Fish store in Seattle has one of the better freshwater fish collections but I am not sure if he would pay you for them. Blue Sierra in Issaquah has bought both salt and freshwater fish from me so I would definately try them, talk to Jonas there he is manager/owner. Kings Discus in Seattle is another possibility, he is known for his exotic freshwater fish collection but I am not sure if he deals in Cichlids. I am sure there are others but these are the ones that come to mind in the Seattle area, good luck and let me now who you end up dealing with.
If they are african cichlids, you may have some luck with Fish Gallery in Renton. I have sold fish to them before. You are best off talking to them on a weekday when it is not so busy. If they are south american cichlids you may have some trouble getting rid of them, especially if they are large. The stores love overcharging for the stock on hand, but the truth is they prefer to turn over the smallish fish.