Imagine - if you will, buying this double edged razor from Men Rock.  Once bough you'll only have to buy double edged blades ever again (At about 20p a pop).  You can see how this makes financial sense over Gillette etc ... what's more double edged blades never change so you don't have that paralysis in the supermarket where you can't remember if you're a mach 4, 73 or a fusion whatever blade guy!

Double Edged Razor