Are there any free sites that have price guides for mainly marvel comics ?!

Question: I 've got a few thousand 83 - 89

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Answers: I 've got a few thousand 83 - 89

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This one's pretty good.
http://www.comicspriceguide.com/

It has just about every comic that you can think of, but you can filter out everything that isn't Marvel by searching by publisher (or just browse by title).

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you can try http://english1.isoshu.com

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