Closing Threads is now enabled.
You can now open and close your own threads. This way, if you have sold something, simply close the thread and it will drop off of the top of the list. We do suggest also editing your initial post to say that it's sold or no longer available.
We are not allowing full deleting of threads at this time, because we need to have a record of all of the posts in the event someone receives too many user complaints.