Fastest and cheapest way to get BAS or Bs CS for International Student

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Thanks Honguito! That master looks great, tbh was always my first goal, and I know GATECH is about top 10 tech colleges and would help a lot in my career. I heard it's kind of hard to get admitted so was thinking in getting a bachelor first, because, anyway, right now I can't afford it, and starting to study every day again will keep my mind moving until I save for a master. 
EDIT: Just found this in OMSCS forum:
 I just got an email from the Office of Graduate Studies saying that my Australian Bachelors isn't equivalent to a US Bachelors degree and I should either take another undergraduate program at a regionally accredited college in the US, or study for another Masters before coming back here to apply for OMSCS

So I guess I will have to pursue an US bachelor first. We are back at the beginning, picking a bachelor first (but having in mind the masters in the future)

If the OMSCS is your goal, you could always apply for yourself and see what they say. If saving money could be an issue, it seems like it could be better to go straight where you want to go.

If you just want to practice studying, how about non-credit-bearing courses? Georgia Tech has a bunch of those for free: https://pe.gatech.edu/massive-open-online-courses