Just adding some findings, which could be helpful to other people. The options are:

1. Qatar University: For most majors tution fees are QR 800-1000 per credit. Most majors has at least 120 hours credit requirements which comes down to around 100-120K QR for the whole program. No idea, how tough is to get an admission though. Another issue, for many majors, medium of learning is Arabic.

2. Other foreign universities: CMU, GU and others offer different majors which cost even higher than QU in most cases.

3. I could only find one community college - College of North
Atlantic Qatar which offers technical diploma courses that too only in business and science subject. Per year cost is also 20K at least. It's the cheapest option I could find.