Have you tried International violin Co.?
http://www.internationalviolin.com
That is where I got the FB for the bass I am building-- it seems to be very good quality, and they have always been very fast to deliver. As I recall, I paid $162 for the board-- I think that was their highest priced board, and that did not include nut or saddle.
I just looked at their website-- their highest priced 4/4 board is $212-- I got the 3/4 size.
If you call them (1-800-542-3538) and ask for Ken, he will give you the particulars on the measurements.