The EE is a section on this site (CGN) called the Equipment Exchange (EE). If you go to the forum page with all the forums, scroll down and you will see the Equipment Exchange forums. To see them, you have to go to the USER CP at the top, left, go to "USER GROUPS" on the side menu, and select the EE button and click Join Group. It will take about a day or two to clear you, as this is to keep spammers out.
Note that this is basically a classified adds, and most of these ads are private sales, not business sales. But Their are a number of dealers who do sell on their.