Jomox T-Resonator

This one is currently on Boston Craigslist for $300 here.  Via the seller: "The T-Resonator transforms timely events into an analog feedbacked filter network. The T-Resonator is something like an M-Resonator + Digital Delay. But you can select 8 different delay algorithms, each with different delays and different feedbacks and modulate them even with an LFO. Delays reach from less than a millisecond to 1 second, range and structure is depending on the algorithm.

The full description with samples can be found here. Includes power supply and manual."