If you're still on the hunt for Wii Fit (in the US) then these two sites are worth paying a visit - zooLert and WiiAlerts. They both keep a constant eye on Wii Fit at many of the top online retailers (Amazon, CircuitCity, BestBuy, Walmart) and will alert you via email or sms/text as soon as stock becomes available.

Thanks to clevelandmom who posted these sites on her blog - she received alerts yesterday morning and was able to order a Wii Fit online.

Update: UK visitors, check out Wii-consoles.co.uk for realtime Wii console stock alerts and Wii Fit stock alerts.