Posted By:
CS BolayHmm, can't think of much for the newer stars, but I would wholeheartedly recommend the esteemed Mr. Simon for vintage Hollywood material. The latest email list made my mouth water...man, if only I had the cash. :S
www.richardsimonsports.com
I'm usually not big on blanket recommendations based on trade group membership, but PADA does have many of the best vintage non-sports dealers in the business, including Bill Panagopulos at Alexander Autographs.
http://www.padaweb.org/
As for newer stars...Markus Brandes of Germany is very knowledgable and has a lot of nice material.
http://www.autogramme.com/