The Links below can be used to find out the value of your books either raw or graded. Both do require a subscription, but will provide you accurate values of your books in your collection.

I do highly recommend both as anyone who is new to this hobby should have a good understanding of what they are buying. Both of these are used by Comic shops and Dealer at comic-cons. So they are a good way to find out if you are getting a good deal or not.

This Link is for Raw Book Values

This Link is for Graded book Values