Here's a guy I came across who has a little shop up in Oregon or Washington.
robertgeeviolins@earthlink.net
I can't remember the exact price he quoted me for new ebony boards but it was cheaper than most places. I don't think he had any bass boards in stock but he would get one from his supplier and said they were good quality.
I ended up getting a used board from someone upgrading so I didn't get one from him myself.
kevinlee