Financial aid/Scholorships for expat

Finally making some progress. My son will take the mock IB exams at the end of May and we are hoping for a score of 32-34 range. He will take the Act June 9th. I’m currently in the process of filing my usa taxes thru the streamline procedure. Any suggestions on good computer science universities in the USA that are affordable? He doesn’t care that it’s note “brand name” but that has a good program, that he won’t be forever financially indebted and preferablynortheast, south or Midwest. Nothing on the west coast.