Wii Fit is currently back in stock at Tesco. I just ordered online and will collect in store on Monday for free. Store collect currently available in a limited number of locations, enter post code to find nearest.
Standard next day delivery is £4.85 making it £69.56. I know this is only makes it 43p cheaper than others, but if you can collect instore, it's a good deal! Don't forget Quidco!