Prices: Coop-Hits.com - Banner Impressions

Banner impressions: you buy banner exposures. That's very cheap and has no guarantee how many times the banner will be clicked on. You usually buy those if you want your brand to be known. Regardless if many people will click or not, you want people to see your logo or company name everywhere.

500,000 impressions = 25 U$
1 million impressions = 50 U$
5 million impressions = 240 U$
10 million impressions = 450 U$
50 million impressions = 1,950 U$
That's for banner size 468X60 - max. 15k

Other sizes are possible for the same prize: (250X72, 180X100, 120X60, 88X31, skyscraper) - but are usually slower to deliver and often the smaller they are, lowest the click rate is.