Wii Fit in stock at Smyths toy store in Salisbury. Also, currently showing in stock on there website checker (www.smythstoys.com) although you can only pickup instore.
When I went yesterday evening they had 130 instock with another delivery of 70 due in today or Tuesday.
Also, if you join the loyalty scheme (£3), then you get 10% off!
Guy in the store said they had yet to run out!!!