If the price is too good to be true, it is probably a fake.
If a company offers an autographed item well below competitors' prices and market value, then consumers should be wary. An example would include Michael Jordan basketballs, which some companies sell for as low as $150. Given Jordan's current exclusive contract with Upper Deck and difficulties associated with obtaining his autograph, the Tuff Stuff Magazine market value of an autographed Jordan Basketball is $500, while Upper Deck Michael Jordan autographed basketballs retail for up to $1,500. (Caution: a high price does not by any means suggest authenticity either.)