Zyriax just told me that he pre-ordered Windows 7 Home for 50€. There's many online shops that had this campaign, and they were sold out in minutes!!! I found now a pre-order copy at amazon.co.uk of Windows 7 Professional (Home not available anymore), for 90£ instead of 220£!! I pre-ordered it because Amazon only charges you when they deliver, which will be in october, and so I can still cancel my order if necessary. Better this than pay 220£ later.