Instead of ringing around to see if they want any from you, make the same calls and tell them you are interested. A sure sale is something most LFS are happy to find. There are staples in every fish store that they sell n huge numbers but most bring in a few tanks full of unusual fish to provide some variety. When they have an idea of what people are looking for, they will often try ordering that at least once. After the novelty is gone, the fish sometimes stop selling and the shops try something else, but they are always looking for suggestions on what unusual fish to try out.