Loscha writes: "While not as cool as the Kraftwerk Vocoder, a jackfield from the BBC Radiophonic Workshop is still very neat..." Quite right: eBay item #120003732436 is a jackfield/patchbay which was apparently used in the legendary workshop before being shipped to Australia in the luggage of a former BBC engineer. As the vendor rightly says: "I can say, unashamedly, This is the best jackfield in the entire world. Period. You will never see anything like this again in your entire life." Unfortunately, you've just missed the chance to have something to plug it into. eBay item #250001734656 was a AKG BX20 spring reverb unit, "As used in the BBC Radiophonic Workshop", although it's not totally clear if that was this actual unit, or just the model. Either way, it went for a not unreasonable £470.
On the subject of that Kraftwerk vocoder: The auction page has had 47,000 hits with a $7,600 high bid, and still two days to go. The Music Thing effect strikes again...