Wide range of course is available for international students in New Zealand. For commerce, general courses available at universities in New Zealand for postgraduate level are:

Master of Commerce (MCom)
Master of Business (MBus)
Master of Business Administration (MBA)
Master of Entrepreneurship (MEntr)
Master of Tourism (MTour)
Postgraduate Diploma in Commerce (PGDipCom)
Postgraduate Diploma in Executive Management (PGDipEM)
Postgraduate Diploma in Tourism (PGDipTour)
Postgraduate Certificate in Executive Management (PGCertEM)
Diploma in Business Administration (DipBusAdmin)