My lurking of newspaper classifieds finally payed off and I found a source of junk, or "schrott" as we call it here. Out of this pile of schrott I pulled my first,second,third,fourth,..., ninth,tenth mechanical keyboards. Will be going back for more next week, if anyone is looking for german layout Cherry or Alps boards I might be able to grab some extras for a reasonable price. Im not 100% sure, but I think there was also one or two SDL-plug Model M boards and plenty other boards with mechanical switches I couldn't place due to my definitely lacking knowledge. What I know is primarily from my lurking here.
And for now I've found my new keyboard: the AT-102D, replacing my Dell Quietkey that I grabbed on a fleamarket for 1 €. I',m dreading going back to university next week with their icky, non-clicky membranes.
What I pulled on this first trip:
3 G80-1800 1AT/2ps2
1 g80-1851 USB
1 Dell AT-102D
3 G80-3000 LS Blues
1 G80-1000HFD Blue
1 Black Qtronix board with Cherry MX Blues AT-connector
Back to cleaning and testing for me, so far not a single busted one, hurrah.