If you've finished with a purchased curriculum, but the books are still in good shape and you'd like to pass it on, post it here. Sell, trade, or gift is up to you.
If you're looking to purchase a curriculum, post a request here. Maybe someone has just finished with it.
To get you started, here is a Yahoo group didicated to just this kind of thing. It's not local, but you may find what you're looking for anyway!