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I know a couple of options that may be of interest:
- There are a few copies of Son of Interflux available NEW on Amazon in the US: https://www.amazon.com/dp/0439938732. (These are imports of the Canadian version.)
- The Internet Archive has a couple of copies of Son of Interflux available as e-pub and .pdf versions: https://archive.org/search.php?query=creator%3A%28gordon+korman%29