Actually I am just looking for the same bamboo board replacement in case I damaged mine. I live in Canada here and that will cost me a lot more to order from Outback Adventure than any local store or Amazon. However I am not able to find anything yet.Are you looking for a HDPE board similar to Outback's JK offering?
I contacted Outback a while ago. They put me on a list so I'd be contacted the next time they made HDPE boards--apparently they're not as popular as the bamboo.
Agree with this, they can use the existing board as a template and use a router with a bearing to trace the new one then plane it to the right thickness.My suggestion would be to take your existing board out and take it to a local woodworking store that may have something similar--like a maple back-up board in the same dimensions.