How about $15 shipped with knob, wires, and connector -- everything. I'll even give you my FedEx #.
6spdcoupe: May I ask what you use instead of the bass knobs? Do you simply use your non-fader (aka subwoofer) level control from the head unit? The more I read about the bass knob, the more I think one can skip it if the head unit can control the bass level instead. Or am I incorrect?