Yeah, agree with vivid and pixeladd https://adwords.google.com/select/KeywordToolExternal this is the place that you must check. this tool now gives you exact data about the searches from previous month.
I think google adwords tool is best but cpc they display is not right one . They display so high rates in those results but we get only few cents .
Don't use it to find the cpc, it's main use (for me anyways) is to find keyword popularity. If your creating websites based on "high-payouts" you don't deserve to run a website. I'm sure those are all the same people that use the same cookie cutter template on all 10 of their websites... what a joke...
https://adwords.google.com/select/KeywordToolExternal is the best because it comes from the main source i.e google. I find it very effective. Also https://adwords.google.co.uk/select/TrafficEstimatorSandbox is great for working out average CPC
The AdWords Keyword Tool now shows the search volume, I think it's best tools to use; http://www.google.com/insights/search/
Here are few Google tools that will help google.com/trends google.com/insights/search/# adwords.google.com/select/KeywordToolExternal