I have spend now some time searching here, but have not come across any solution to my community needs. I'm not looking for a Shop system. What I need is Classifieds Forum where my users can add items for sale and manage their offers by their own. Means something like: Post is active for a defined period of time or till the post-owner deletes it, etc.
I have here an example for phpBB:
The items are categorized and listed easy and convenient in a table view. Maybe somebody knows something similar for xenForo?