I read in a musician's forum, that some of the earliest guitar effect pedals used germanium transistors, and the musicians loved its sound.
About a decade ago, there was a company called Germanium Power Devices that still manufactured Ge transistors.
The company has now changed its name to GPD Electronics, and now exclusively manufacture Ge-based optoelectronic devices, but no transistors.
So unless someone is still making them in an ex-Soviet block country, I think that they will become extinct.
Hold on to your collection.
EDIT: Could you post some photos of your transistors?