If you're going to compare prices on eBay, look for the _ending_, not the asking price. A $500 asking price does no good if the piece doesn't get any bids.

Out of curiosity, since I know space autographs, can you post a pic of the John Glenn?

Best way is to just compare prices on ebay and amazon. Sadly price guides are useless anymore, the value is reflected in what someone is willing to pay for it, some guide could say its worth $200, but if nobody is willing to pay more than $40 is it really worth more than that?

My mom passed and left me her autographs. I have authentic deniro, dean Martin, Bette Davis, john Glen, robin Williams.... I'm interested in selling, but don't know the value. I have no vehicle to get around. Any online price guide??