try e-bay :)
If they have been autographed or signed by the celebrity.
A great place is at WWW.EVERYMEMORABILIA.COM there is cool Amy Winehouse Autographed Memorabilia, there, and there authentic!
350
1990 racing poster of dale earnhardt sr autographed
Many of the autographed poster are worth prices close to $75 each. The exact price will depend upon the actual poster and its condition.
800
300
$500
Amazon
Around $150
it is worth 5 dollars
An individual would be able to tell if an autographed football is authentic by reading the signature, as well as going and taking it to a specialist of which is involved in reading such things.