While googling around the 1001fonts.com turned out to be a miracle answer to my question.
Mostly because:
- it has an amazing collection of typewriter-like fonts (137 when writing this),
- most fonts are free for private use and many are free for commercial usage,
- it has an on-line test tool, which allows to type any text and validate support for given language or character set without downloading the files.
With just a ten minutes of quick work I managed to locate seven fonts that:
- are purely typewriter-like,
- supports Polish language's national characters,
- are free for commercial or private usage (donation encouraged!).
This list included:
- Free For Commercial Use:
- Free For Personal Use only:
- JMH Typewriter,
- Bohemian, and
- Punktype.
Far, far more than I expected.