Pay Per Click Can Deliver Good Returns
Here is a tool to help you determine if a word or phrase (term) is a good value.  Remember, your cost at Yahoo is $.01 more than the bid just below yours.  For example, if the highest bid is $20.00 and the next bid below it is $.10, the cost to the person bidding $20 is $.11 per click - a great value.  Use the tool below to get the facts.

https://adwords.google.com/select/TrafficEstimatorSandbox