http://www.marrow.org/ the donor registry has over 10 million people who have offered to donate marrow. I believe there are 6 factors to match
and often members of the same family or race will be more likely to match. sometimes 5 out of 6 is as close as they can get.

www.asbmt.org The American Society for Blood and Marrow Transplantation


here is the northern california contact http://www.bloodsource.org/
and here is their marrow info page:
http://www.bloodsource.org/AboutUs/ServicesPrograms/NationalMarrowDonorRegistry.cfm


http://www.redcross.org - these folks have blood donation,
but might also know about marrow issues