Superior is the best source for serious space related memorabelia and collectables. Their auction catalogs are excellent resources.
Space art gallery, neat stuff.
Neat site, corporate info and images.
I have contributed to this organization. Consider contributing to them!
I've enjoyed working with these people years ago, they do neat stuff.
They work on some of the fundamental issues of the human body in space. I can see lots of eathbound application of their work.