I have purchased Gillette Mach 3 cartridge blades from ebay that are not as sharp as the ones at Walmart. They were terrible. I simply could not use them and I tried several different cartridges. I noticed that the manufacturing location on the back of the box is different than the ones from Walmart. I cannot remember the different locations. I had to throw away the ones I bought from ebay. Brand new blades thrown away I know from the safety razor Gillette blades that the Swedish Gillettes are superior to others. Or at least that seems to be the most popular belief. Has anyone found the best(sharpest) mach 3 cartridge blades?