I've always found that quality aftermarket rotors are on par or better than stock for my Japanese cars.
However, the cheaper Autozone, etc ones are definitely not as good. These are not made as well and won't last as long.
But if you're in a pinch, you could pick some up and then swap the pads/rotors to good ones when you can afford them, keeping the others as backups. I've done this several times.