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

Michael auf der Lake (Germany)
autographs

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

Richie Barrett (Oregon)
autographs

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

Dennis Dillman (Washington, DC)
autographed and flown covers

John Fongheiser (Ohio)
flown artifacts and hardware

Ed Fortier (Massachusetts)
moonwalker autographs

Tom Gwilym (Washington)
autographs, flown artifacts, hardware, models, and toys

Douglas Henry (California)
test pilots and astronauts autographs, books

Ian Hepworth (United Kingdom)
autographs

James Hill (Australia)
Woomera rocket range and covers

Bernie Hogya (New Jersey)
autographs, flown artifacts, and hardware

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

Matt Miller (South Carolina)
autographs and in-person photographs

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

Mike Quinn (California)
autographs

Edo Rajh (Croatia)
astrophilatelic material

Helen Reeves (Oregon)
autographs

Scott Schneeweis (Hawaii)
autographed covers, flown artifacts, spacesuits

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

Alan Thompson (Texas)
autographs, in-person photographs and space art

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

Steve Zarelli (New York)
autographs (space and non-space related)