DotNetNuke Marketplace
The dotnetnuke marketplace is the official e-commerce gateway for the dnn ecosystem. it's the place to buy and sell dotnetnuke modules, dotnetnuke skins, and other dnn offerings.
http://marketplace.dotnetnuke.com/
Modules via Snowcovered
Buy and sell dotnetnuke modules, skins & more!
http://www.snowcovered.com/snowcovered2/default.aspx?r=9804aa6e87
Overzicht gratis modules
Listing of free dotnetnuke 3 modules
http://www.cathal.co.uk/default.aspx?tabid=80