At least for CONUS people, HHKBs are cheaper through Amazon.co.jp + Tenso proxy. However, EK gives you a 2 year warranty service. No idea what the options are if a Japan-purchased HHKB has issues.
What I did was order my HHKB board from EK, and lots of shiny accessories (keycaps, acrylic wrist rest, blue+red Esc+Control key pack) from Japan through Tenso. EK shipped my board out super-fast. It arrives tomorrow.
I would have ordered the Type-S, but it only comes in white.