With the unique free multeCLASS Classifieds webtool you can place your own classifieds on your own page and get coverage on other member' websites aswell. The concept is similar to having a banner exchange mixed with google ads (not ppc), all classifieds are listed for a period of 1 month renewable for an extra 2 months, and can be stopped at any time. There is no limit to the number of classifieds you can add at this point in time, it may be introduced in later version however.