.
. . . include Net54's own Richard Simon too. Check out his web site at
http://www.richardsimonsports.com
Other dealers worth checking include Bill Corcoran, Ron Gordon, Jack Heir, Rich Albersheim, Jack Smalling, Jim Stinson, and Quality Autographs of Virginia (Kevin Keating).
I do not believe either Bill Corcoran or Ron Gordon have web sites, but you should be able to google a current mail address for both, and ask for a current listing of items available (Corcoran also has a regular mailing listing too). Jim Stinson has a web site, but his on-line listing and sales tends to be via eBay listings. Not sure if Jack Smalling has much from that era available anymore on his web site listing. And QAM extensive listing, and pricing, are sure to catch your attention (if not your wallet).
Good Luck hunting.