I'm selling a Cmoy-Hansen with crossfeed (two position crossfeed). It comes in a translucent blue box built by erix (I've had it only a couple of weeks--I got it in a trade with a fellow Head-Fier). It uses a OPA2132 opamp and can be run internally on two 9V batteries or an external adapter, 12-30VDC. The external adapter is included.
I'm asking $30 plus $7.50 for shipping (shipping is kind of high because the power supply is heavy). I ship to USA only. Please see attached picture for further details.