There is only one Bradley certification course and it is conducted by the Bradley people themselves-the American Academy of Husband coached childbirth. Their address ishttp://www.bradleybirth.com
(I don't know if that made a link or not-I'm not very computer savvy.)
I did it in 2000 and it cost almost $1000. You have to attend a 4 day workshop, read about 10 books and do a WHOLE lot of writing on them, teach a practice class, and then take a final exam. You have about a year to get it all done in, which is about how long it took me!