Of all the categories in all the eBays across the world, surely there's no finer category than 'Analoge Instrumente' on German eBay. It's a treasure trove of goodness, like item #160059220196 - this beautiful Mini Pops preset drum machine, made in 1969 by Keio Electronic Lab, which became Korg. Used by Jean Michelle Jarre (not this actual one) and yours for €99.
Elsewhere in 'Analoge Instrumente' right now, item 300055121568 is a great looking bit of weirdo vintage lab/music gear. It looks to me like a delay/reverb, but the seller says it works best as a fuzz box on his Moog. And item 250057054580 is a breathtakingly awesome-looking CRB Computer Band - which seems to be an old drum machine covered in buttons and switches, with two octave keyboard. Sort of like a MonoMachine. There's boards to build a 303 clone, leaflets about Theremins from 1930s Berlin, a super-rare MC-8 Microcomposer... Why can't every eBay category be like this?