Sensor Excel
I would probably go to a twenty-cent Bic before using any of the carts.
I'll argue that an injector is a cartridge razor, so I'll stick with that.
I'd grow a beard
I'm not sure why some people are finding it hard to find the Gillette Sensor excel handles and blades? Here in Canada, I have no trouble finding brand new Sensor excel blades and handles. They fully stock them at Walmart and Zellers for about $6.50. Everytime they sell out, they always get more right away. There are full pegs of new Sensor excel razors, you get the handle plus three carts (two twin blade ones and a 3 bladed bonus cart). They also stock the 5, 8 and 10 cart refills. The 8 cartridge refills are the 3 bladed ones.
I haven't tried any of them but I've heard only the best about the excel. Maybe I'll give it a try one day.
I would use my trusty 1983 Atra. That was the most modern I ever went until recently when someone gave me a Sensor. Nice razor but the cartridges are too expensive. Is there a generic blade for the Sensor yet?
mach 3