Well, what "Signed Baseball" do you have to sell? I buy them :) If you tell me who is on it I can tell you a approximate value of it!
I have done some research and belive the baseball to be from the 2003 NYY team.Joe Torre (manager only)
David Wells
Ron Coomer
Alfonso Sorino
Mike Stanton
mike Mussina
Steve Karsey
sterling Hitchcock
Bernie Williams
Ramiro Mendosa
John Vanda Val
There are others but unable to make out,This is a genuine signed ball(not printed)
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If you have a few rare, and high priced baseballs you might want to shop them around at a number of auction houses. They will help you with get the baseballs authenticated, and appraise. Their targeted auctions will get you top exposure to the right people, and that will mean more value.
I will leave a couple of links below to some auction houses below, but shop around for the one that best fits your needs. eBay would be another option.They have a large base of collectors of Baseball Memorabilia
If you sell your baseball to a dealer you will only get About half the market value, more or less depending on how long the dealer thinks it will take to sell. eBay would be an option, if you are an established seller. An auction house that specializes in Sports Memorabilia will get you top dollar. A Jackie Robinson single signed baseball is worth about $3,000.-$4,000. Prices may vary based on condition, and the type of authenticity that accompanies the baseball. Signatures that have not been properly authenticated could sell at half the market value or less. If you use an auction house they will help you with getting the signature authenticated.
You will find plenty of signed baseballs on eBay. Be careful not to buy any signatures that have not been properly authenticated. For a little more money you can buy off a reputable dealer like steiner sports as they stand behind the signature and can be easily contacted if you have a problem.
You can sell them on ebay, or at a yardsale, or anyplace you want really... You could put posters up and ads for people to come and see your collection and if they want to buy them.