I know this is standard price, but there's lots of folks out there who get student discount etc. and thats primarily who this is aimed at. They only started pre-orders this morning:
"Wii Fit will be available to pre-order for a very short period from Wednesday 2nd April 2008 at 11am. Demand for this item is massive and stock is extremely limited, so orders will be on a first-come first-served basis and are strictly limited to one copy per customer."
(with balance board)