heres a little little game/manga shop about three minutes from me in Ijiri, Fukuoka, its called Fripp (フリップ) and they have several wii's for only 17800 yen, supposedly the one i got was used, but im not so sure, it came in the original box with all the twistties and everything and it was in perfect condition.
i do find it a little wierd that their DS' are about as expensive as their wii's, but then again, wii's are MAD popular in my area, everyone in my classes has them. they have ps3s for around 30000 yen too, its crazy (smallest HD size though)
brawl is actually 7100 yen at the store near me if you preorder, but i was stupid and didnt do that, and now they dont have any more preordr slips, so i have to pay an extra 700