If €19 is genuinely too much, wait for a Steam or Aerosoft sale (they happen several times a year). In the meantime, explore the excellent Hamburg maps and buses on OMSI WebDisk—there are community-made alternatives that require no piracy.
The best part about the Hamburger Buspaket is that it's available for free download and install. Players can easily download the add-on package from a range of online sources, including Steam and various bus simulation forums. OMSI 2 Add-on Hamburger Buspaket Free Download Install
Searching for "OMSI 2 Add-on Hamburger Buspaket free download install" is tempting, but the risks far outweigh the rewards. Pirated versions will ruin your simulation experience with errors, and they disrespect the modders who spent hundreds of hours coding and texturing. If €19 is genuinely too much, wait for