Occasionally, publishers like VGB Verlagsgruppe Bahn or hobby retailers provide free PDF excerpts or older "test" editions to entice new subscribers.
The Internet Archive hosts several older issues of MIBA Spezial (e.g., Issue 107 and Issue 114 ) available for free digital borrowing or streaming. miba spezial free
If you are looking for specific guidance, the Spezial issues often cover: the Spezial issues often cover: