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