I just got 6 blades for £4.44!
Possibly student only accounts... prime needed.
To do so go to the link and apply ALL 50% off vouchers for the PROSHIELD ones.
Select 2 month delivery.
Then add proshield COOL to basket.
Checkout with subscribe and save. Discounts by £16 odd!
Someone also got the ORIGINAL proshield ones for £2.34 odd!
Also works if you just select the cool only discount apparently. even better!
Cancel after first delivery if you want to :)