where shall i start, hmmmm
Akai S900 with trigger input board - £5
Korg SDD2000 delay - £5
Roland MS1 sampler- £8
Cheetah SX16 - Free
Paia modular system - £40
The one i'm most smug about is a Spectral Audio Syntrack analogue rack synth for £11. Go to the spectral audio site and theres a page about a common problem with the power diodes and how to fix it. The guy selling it plainly hadn't been there.
Oh, and a Kawai 100F analogue synth for £30 that had spent its entire life making wind noises for an amateur dramatics company. You wouldn't get one for under £300 in the real world, its the ultimate Dr Who / Radiophonic workshop machine