This is something I saw a presentation over recently. Looks like a really cool program; I'll sign up if I ever get my shit together.
I've been on the bone marrow registry forever. At the time it was free, I took part of a drive. Then a few years later they were charging people to the costs to get the blood work done etc., which was not inexpensive. I know it does cost money to run such a program but it seemed like a barrier for people. I'd say cut out the quarterly four color glossy newsletters to myself. I hope they changed that policy.
I've been a marrow donor for a number of years, too. They once called me to tell me they were doing extra testing on my marrow, so I thought I was actually going to be put to use, but then I never heard from them again. Part of me really wants them to come calling one day.