hi soljah, best place I have found is actually JB HIFI. If you talk to Dean S. from the Miranda store he can help you out. Will probably recommend a JL Audio amp around 1000W RMS or Kicker which is I believe 1200RMS. Make sure you dont skimp on the amp running that sub because it need every lil bit it can get. Also look into running 0 gauge wiring to it, forget 4 gauge its too small.
Good Luck,,,