Gillette is on my shit list.
Well, the title is misleading. The real problem is incompatible interfaces due to their “innovative” upgrades. Gillette have pioneered in razors with 2, 3, 4 and 5 blades. Whatever next!?
Incidentally the price for 5 sensor excel double-blades are 5.5USD in Argentina.
Their newer Mach3 Turbo triple-blade set of 4 (not 5) costs about 8USD. I recall that being a lot cheaper than the UK.