Northcutt has a black cotton sateen that has a great feel. One side has a sheen (like polished cotton) and the other side is flat. No one here stocks it, so I have to special order it from my LQS. I'm waiting for an order to come in now, and have asked that they also get the cream. You can use either side or both for a different look.
Otherwise, I use Kona cottons. The quality is good and there is a wide color selection. Hobby Lobby always has it, and it's usually on sale.