Try comparing it to the other autographs and find out the average price for the similar autographs, and probably put your price close to what the others are.
Now...Uhhh.... Used Around $90.00 New-Mabey $120-$140
50-100 depending on what hat its on.
Probably not very much since they are pretty easy to get. I have like 15 sitting in my room
normal new skateboard deck runs around $55 USD.
50p and a packet of quavers..:)