After seeing these reviewed on the gadget show on channel 5 I had a look around. Superdrug have them at £4.98 + £3 postage. Quidco should work out at a whopping 71p, making the cost to you £7.27. The high street RRP is £9.99 for this razor, making this a discount of 23% overall.
If you order over £35 you'll get free p&p, and more quidco.
There is also a 10% discount voucher for Superdrug for your first order, but I have not tried it.