Pedro Amaral (Portugal)
autographed covers and photographs, flown artifacts
Michael auf der Lake (Germany)
autographs
Daryl Barkle (New Zealand)
autographs, covers, artifacts and medals
Adam Bootle (United Kingdom)
autographs
Noah Bradley (Virginia)
autographs, flown artifacts, hardware and memorabilia
Ray Brennan (Maryland)
autographs, artifacts, and books
Ben Cooper (Florida)
autographs, flown artifacts, hardware, and original launch photography
Robert Cordingly (United Kingdom)
autographs, books, flown artifacts, medals, patches and pins
Paul Cox (United Kingdom)
autographs, artwork, souvenirs
Dennis Dillman (Washington, DC)
autographed and flown covers
John Fongheiser (Ohio)
flown artifacts and hardware
Ed Fortier (Massachusetts)
moonwalker autographs
Douglas Henry (California)
test pilots and astronauts autographs, books
Ian Hepworth (United Kingdom)
autographs
Derek Horne (United Kingdom)
autographs
Veniamin Kramer (Ukraine)
autographed covers and cachets
Claudio Mariani (Argentina)
autographs, medallions, patches
Robert McLeod (Georgia)
autographs (also, other website here)
Lawrence McGlynn (Massachusetts)
autographs, flown artifacts and medallions
Gary Milgrom (Georgia)
autographs, flown artifacts, hardware
Rick Mulheirn (United Kingdom)
autographs, flown artifacts, hardware
Mike Pace (Australia)
autographs of the first 12 cosmonauts
Brian Peter (Lousiana)
autographs and flown items
Steve Procter (United Kingdom)
autographs of astronauts and cosmonauts
Mike Quinn (California)
autographs
Edo Rajh (Croatia)
astrophilatelic material
Helen Reeves (Oregon)
autographs
Scott Schneeweis (Arizona)
spacecraft and launch vehicle hardware
Paul Schultz (California)
autographs, hardware, flown items
Guido Schwarz (Switzerland)
autographs, books, hardware, flown items, patches
David Meerman Scott (Massachusetts)
autographs, hardware, flown items
Henk Stroo (The Netherlands)
autographs, models, patches
Rob Sumowski (Georgia)
autographed 16x20 photographs, models
Matt Thomas (United Kingdom)
autographs, films, flown artifacts, hardware
Geoff Viney (Tennessee)
autographs
Mark Wells (Alabama)
books, documents, hardware
David Worrow (United Kingdom)
autographs, books, artifacts, souvenirs
Michael P. Wright (United Kingdom)
autographs and flown artifacts
Nick Yates (United Kingdom)
autographs, covers