U can try
College of north atlantic located in duhail
www.cna-qatar.com/
Fees per year - QR 20000/-
This is the cheapest fee of an international College in Qatar when compared to other Colleges.

Other ones...
U can try CMUQ College under Qatar Foundation
Qatar Foundation got lots of College, i think Only CMUQ got business studies.
check out for more info
www.qf.org.qa