Fair price for banner advertising click through

I have a German web site about notebooks

I just want a new notebook and I want to finance
it by banners for this notebook.

What would be a fair price for a Click Through
from a site specialised for notebools,
even having a big test report for this notebook?

Roland Mösl
http://www.pege.org Clear targets for a confused civilization
http://web-design-suite.com Web Design starts at the search engine