I'd say just buy your gear in the US. Just about everything is considerably more expensive here. For example, Froogle says you can get Rome 390s for $133 to $190. Over here, they cost 31,000 yen ($300 US)... on sale. All the shops around here are already having their season end clearance sales on snowboard gear, so you probably won't find much in May.
If you get the chance, try out a Gentemstick powder board.