According to Google, Adwords cost is as much or as little as you would like to spend. In reality, it may not work out that neatly to get the results you are hoping to get, but there is a wide variety in spending options.
The basic costs are a $5.00 activation fee (US dollars) and the [...]

As Pay per click’s name suggests, you only pay for actual click through to your web site. Inexpensive Pay per click internet advertising lists your web site according to your bid for a certain search keyword. Of course, Web sites which pay more are ranked higher.
Pay-per-click internet advertising can be a very reasonable cost compared [...]