Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been properly authenticated could sell at half the market value or less. Add for inscriptions.
around $100 Update: An Terry Pendleton single signed baseball is worth approximately $68 if it is on a Rawlings Official Major League baseball and is signed on the "sweet spot". These values assume that they are all authenticator by a reputable company. An autograph that isn't properly authenticated can be worth as little as half of the value of an authenticated signature. For more prices on single signed autographs see Related Links below.
A baseball signed by Andre on Amazon, is $137.99
$5
How much is a ray tanner baseball
how much is a signed milt pappas no hit baseball worth
300 dollars
1400
15
not much
I'd say over about $4000 for a baseball signed by him in 2009.
a lot
$56,000