Both bumpers appear to be available from their manufacturers.

FLATT Bumper is Y88,000 = $743.65USD

K-STAFF Bumper is Y78,000 = $659.14USD

Expect to pay roughly 250-300 bucks for shipping from japan.

Neither of the companies speak english, so you will need to find someone in Japan to act as a 'middle-man' Paddlesnz on the board has been good to everyone, and should be able to help you obtain one.

-Mike