Pedro Amaral (Portugal)
autographed covers and photographs, flown artifacts

David S. Ball (South Carolina)
space event covers

Daryl Barkle (New Zealand)
autographs, covers, artifacts and medals

Alec Bartos (Romania)
autographs, philatelic items and covers

Adam Bootle (United Kingdom)
artifact, autographs, and books

Robert Cordingly (United Kingdom)
autographs, books, flown artifacts, medals, patches and pins

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

Derek Horne (United Kingdom)
autographs

Richard Jurek (Indiana)
flown currency ($2 bills)

Peter Kanger (The Netherlands)
autographs, magazines and newspapers

Joe Lennox (New Jersey)
flown artifacts, hardware, newspaper clippings

Claudio Mariani (Argentina)
autographs, medallions, patches

Robert McLeod (Georgia)
autographs (also, other website here)

Rick Mulheirn (United Kingdom)
autographs, flown artifacts, hardware

Mike Pace (Australia)
autographs of the first 12 cosmonauts

Steve Procter (United Kingdom)
autographs of astronauts and cosmonauts

Edo Rajh (Croatia)
astrophilatelic material

Helen Reeves (Oregon)
autographs

James Ruddy (California)
lunar flown artifacts

Scott Schneeweis (Arizona)
spacecraft and launch vehicle hardware

Paul Schultz (California)
autographs, hardware, flown artifacts

Guido Schwarz (Switzerland)
autographs, books, hardware, flown artifacts, patches

David Meerman Scott (Massachusetts)
autographs, hardware, flown artifacts

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

Michael P. Wright (United Kingdom)
autographs and flown artifacts