Hakeem Olajuwon basketball autographs and memorabilia is listed here. This includes high end authentic autographed basketball cards such as an Exquisite autograph, Ultimate Collection, and other high end Upper Deck autographs and patch cards including multi color patches and 1 of 1 NBA logoman cards from Upper Deck. He had his rookie card in 1986-87 Fleer and if you can find a buyback autograph of Olajuwon or Barkley, that would be a great autograph for your collection.  Currently, as of June 30, 2010, there is a Sportkings 2008 autograph of Hakeem Olajuwon listed by mybaseballcardspace on Ebay.

My Baseball Card Space Community Forum