I happened to pop into 2 Boots in Bristol today as the first one didnt have what I needed. In both they had the Gillette Fusion Power Razor in the clearance section priced down to £2.50. They did cost around £10!
The reason there marked down is because Gillette has just released a new range, so they are selling off old stock! Not sure if this is nationwide, but thought I would post as there were still a good 20 odd razors in both the Boots I visited
Note: You have to look in the clearance section to find this deal