Webgalli’s  Classified plugin is one of the top downloads in elgg community. This plugin will let your users to create unlimited number of classified postsin the elgg site. This is for Elgg V1.7 and above. See some of the salient features of our plugin are: For full information about this plugin visit http://elgg.webgalli.com/free-classifieds-plugin-v4-for-elgg/

1. Unlimited number of classifieds.
2. Classifieds are seen as a whole (search, tags…) not as seperate images.
3. Classifieds are categorised for easy finding
4. View friends Classifieds
5. Replies on Classifieds
6. Add classified objects Image (optional)
7. River announcements
8. A widget for users profile showing of their latest classifieds
9. Showing tags from classifieds post on the side bar
10. Comments on posts
11. Facebox for viewing large image (provided by the embed plugin)
12. WYSIWYG editing of product descriptions
13. Display products in thumbnail and full size
14. Unlimited number of product categories
15. Product import from CSV file
16. Shoppers registration
17. Paypal payment gateway integration(pro version only)
    

There is a Proversion available for 99$. The demo available in this community is of proversion's. To buy the proversion, drop a mail to webgalli[at]gmail[dot]com

You can buy the Basic version using the "BUY NOW" Button for 25$.