Speaking of roasters, we have a good one here, and it's pretty expensive, but I have been to other coffeehouses on trips and some of them are award winning, supposed to be big deals, and almost none of them can make a decent drip coffee. It's like they design their blends for coffee drinks (lattes, macchiatos, etc) without regard to how they taste just as regular black coffee. They always end up tasting like burnt tires if you get a plain black drip, pour over, french press or any kind of Americano (regular, lungo, long black, etc). About the only place I found good black coffee on a trip was in NYC at the Italian marketplace near the Flat Iron building.
I just get the big cans of Great Value brand Columbian medium-dark from Wal-Mart. It's by no means excellent coffee, but it's better than the drip at many of the coffeehouses and roasters I have been to. My local coffeehouse has coffees that work great as plain black coffee, just too expensive.