Where can I buy hydroxylapatite beads?

[Ed Seijo (BIO)]

I am interested in finding out where I can buy hydroxylapatite (HA) beads 
which are used in the study of S. mutans adherence assays. I have heard 
that they are no longer produced by the company often cited in the 
literature: BDH Chemicals Ltd., Poole, England. If this is true are there 
are any other companies that carry this product? I would appreciate any info.

Thanks,
Ed Seijo