Was in my local Tesco last night (Wigan), and found the original Quattro razor and 2 blades on sale for £2.49!
Having flicked through the site, it was on offer a month or so back at £3.99 and was hot then.
Checked ASDA and they still have it at over £4.
Seemed quite a good bargain to me
(Couldn't get onto the Tesco site and could not find the selection for simply the Tesco store, so sorry if its under the wrong heading)