At least in Cologne they're regularly hitting 300 (https://verwaltung.uni-koeln.de/studsek/content/studium/ruec...). Dortmund was about ~340 last summer semester (https://www.tu-dortmund.de/storages/tu_website/Dezernat_4/De...). The 400 was just an uneducated guess for more expensive regions.

Oh https://www.lmu.de/de/workspace-fuer-studierende/1x1-des-stu....

LMU down to 85 for Munich While that doesn't include a full Semesterticket, it's cheaper than Dortmund without