A Good Drum Machine to use?

For a small price/ free? I want something that can create a convincing acoustic sound, particularly suitable for rock/ metal (obviously in most cases a standard acoustic one would do). I have Cubase LE4 on my computer, and don't expect there to be any cheap to use Steiburg drum machines compatible with an old reduced version of Cubase but let me know otherwise if there is! In anycase, a stand alone, cehap/ free drum machine that I can easily put into Cubase LE4 later as audio files would be good!