Coffee is very cheap if you actually just make it. Maybe not cheaper than 4¢ tea bags sure, but cheap.
Edit: if anyone is curious about making coffee simply at home, buy a French press (fancy doesn't matter, get a $15 one on Amazon) and some coffee grounds (taste is just an experiment of what brand you like. Eventually you'll want to grind your own beans but don't worry about it for now. If you can, get medium grind grounds, as that's supposed to be good for French presses) follow a guide online for making it. You'll need a way to measure hot water like a kettle, but that's the same for tea so hey.