Try
http://www.wizardworld.com . (Where I sell alll my T-Bolts!). You can search for any comic, and they tell you it's price, depending on the condition it is in. Also, you can make a portfolio with a list of all your comics.
You may also wish to purchase Wizard magazine. Every issue contains a list of current comic values.
Hope I've helped,
adrianwatts
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