Georgia Tech has an online MS in CS or Cybersecurity. The CS degree is a little cheaper, classes are roughly $650 each, cyber are around $900. You're looking at around $7k or $12k for the entire degree. I'm currently in the Cybersecurity program if you have any questions.

https://omscs.gatech.edu/ https://pe.gatech.edu/degrees/cybersecurity

Another option is NYU's Cyberfellow's MS for cybersecurity. It's around $16k https://engineering.nyu.edu/academics/programs/cybersecurity...