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I use completed sales to estimate a fair market value.  
 

For common books, you can look at eBay completed sales and Heritage Auctions completed sales.  Those are free.

For something more extensive, it’s worth paying a few bucks a month for GPAnalysis.  That gets you records of completed sales for a wide range of CGC graded books, over a period of years.

 

Edited by SOTIcollector
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in the event an auction house has sold the comic you're interested in, you can typically look on their website, provided you create a user id/login for their website (typically its free).  

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