On week days i deploy a cart probably every other day. Thing is I retired anything that has more than two blades due to how my facial skin goes on ingrown party the next day In the UK I could only find twin blade carts that either use the fixed head design ala K2 or the Contour/Atra design. Handles are a different story, managed to put my hand on a Brazilian made NOS Contour but the only other handle I can find is strangely from Lidl. So currently in my collection I have a pack of 10 blades from Superdrug at £2.55, a handle from Lidl with 20 carts for £3 and some original Contour plus i got on the cheap from Amazon (the price in Boots for these is more than I am willing to pay. Now, the thing is that from these carts I find the Superdrug to be far better for sharpness and smoothness way better than Gillette's own. The Lidl stuff is very good too but tad duller than Superdrug. I think the twin blade system is a something which is on the brink of extinction in the UK so I might hoard a bit more before its too late. I bought the £2 Vector from China but it's as light as a disposable imho so it was retired too.