Oberheim SEM VCF
Jeff Farr's recreation of Tom Oberheim's Synthesizer Expansion Module 2-Pole Voltage Controlled Filter. This module's design was sanctioned by Tom Oberheim himself.
http://synthcube.com/cart/index.php?route=product/product&path=99_126&product_id=421
Available as an assembled Module and as a DIY project.
No info about availability.
$195