"Wilkinson Sword Quatro Titanium Precision Trimmer Razor" with 1 blade (no extras) is half price at the moment in Sainsburys at £3.90.
The normal one was there too (just quattro) at £2.90 or something. I bought this one and i did not realise but it has an electric trimmer too if you turn the razor upside down which is absolute genius! (I've always been a Gillette person, i realise its probably not new)
Doesn't seem to be on-line though so might want to call up your nearest Sainsburys. I got these in Beeston, Nottingham.