Opti Idle buying and installing

My truck didn't come with opti idle. I would like to know how much it would cost to go buy and install. Can anyone point me in the right direction? I've found them used, but I don't even know where to start. Can you buy them new?

 

Called these guys today. They want $2400 and another $300 for install. And according to the Freightliner guy I talked to today, the opti idle is no longer available. He claims they have one left in some warehouse somewhere. Cost is $800 plus another $800 for the climate control. He didn't know what install would be.

I'll keep searching, but does anyone know of a cheaper aftermarket opti idle?