Ive been trying for a long time to sell my 29 gallon. Ive Placed an ad on this website, and I cant sell it. I live in South West Florida, and if you know of any place I can post an ad please tell me.
You might ask your lfs if you can put up a small advertisement in his shop. Many independent lfs have a place where their customers can do this. Also, supermarkets and laundromats have bulletin boards for their customer's convenience too.
Another thought is to contact your local aquarium society. They might know of someone who could use it, especially if your price is good, and many of them have forums or websites you can list them on too.