I believe that Amazon.com is the main site requiring the ISBN, so most online auction sites like eBay would be a good place to try.
A Robbie Gould autograph would sell for 1 dollar for every point that he has scored in the NFL, true story. I read about it... IN A BOOK!
Yes he has a autograph to sell.
The ISBN of The Sell-In is 1865084123.
prolly ebay, if not a rich auction
-$1
No. Some books and self-published books may not have an ISBN.
eBay is a great place to sell Jordan cards.
Ebay.com
1600
I'd try eBay or Craigslist.
Information available on the internet suggests that if the owner of a certificate of authenticity for an autograph was to sell a famous autograph then it would fetch far more if sold with a certificate of authenticity than an autograph that was sold without one.
Only if you have written permission by the person who's autograph you are trying to sell. Otherwise it can be deemed as fraud or a type of theft of one's property without due reimbursement.