Grounding help: steel studs, ENT, and NM + M boxes
As for grounding screws, you buy a bag of 50 of them (or generic 10-32 screws), and the (threaded) holes for them are in virtually every metal box, usually in a "dimple" so that the grounding screw can be screwed in even if the back of the box is hard up against a wall as mounted. They are not supplied with the box.