Approximate costs of keywords in Google AdWords

[MainstreamMktg]

Just wondering if anyone has any suggestions about how to go about getting some approximate costs for keywords through Google Adwords to assist my SEO efforts. I don't want to open an AdWords account, just looking for costs. If the pricing is too high then the opened account was a waste of time. So if anyone has any resources to find out this information, that would be great! Thanks in advance!