If you have traffic for sale I highly recommend signing up to
http://www.trafficbroker.com. Test us out for a few days and see what your traffic can earn you. There are plenty of an options for you to use on your site(s) - Banner/button ads - 320x250, 120x600, 140x600, 160x600, 728x90, 900x250 - Other type ads - Floating IM, Popunder.
Once you
sign up and your account is approved you can add sites into your account then go to the Ad Codes section and get the ads for the sites/domains you added to your account and start making some $.