Several years ago many of us in the accounting department of a large research hospital with an associated children's hospital in the Bay Area went to register one lunchtime and we found that white, northern European women with common blood groups are a dime a dozen.
However, anyone with any type of more interesting genetic background is sought after. One of our group was descended from Spanish Jews and she was a match for someone.
So if you have a more rare blood group or heritage, please call. The initial screening is not hard to do.