A bandsaw would probably be the easiest way. I have used a scroll saw to cut 3/8 thick stuff before, but it was a PITA. Once I got a bandsaw I haven't used the scroll saw since. If you are careful cutting you probably could get 3 slabs from it, but I never like doing that unless the wood is tight grained and you wouldn't be able to tell if they were book matched. I like to keep each scales to look somewhat similar in grain pattern.