try gamestation - i think they do a guaranteed price match - or they did when I got mine. At most you'll get 2 controllers with a package but that's Ok for most games - you'll either only need 2 (boxing) or you can pass one around (bowling, golf etc).
If you want 4, you'll have to buy the others extra - and the new motion pkus one is now out (that you get with wii resort) well expensive!!