Old germaniums are in demand for builders of guitar effects pedals, especially fuzz pedals. I do a bit of that myself, but not for profit - I build them for my guitar-playing sons. Some of the Ge transistors in highest demand for pedals are 2N404, 2N508, OC75, OC81, OC44, AC127, AC128, AF127 and NKT275. The absolute cream of the crop are the OC81, OC44 and NKT275. Target gain for pedals is 50-80, although some folks prefer 100 or so.
If you have any of the above, I would be thrilled to buy some - maybe all. If you have a whole bunch, I would be happy to connect you with folks who build these pedals commerically and are always seeking large lots. Thanks.