I have a Whelen Advantage 9000. It has 6 rotaters and has clear and blacked out lenses. I also have the cable for the bar and its about 52" wide and I have a bunch of spare parts. Its off a Rural Metro ambulance I'm looking to get at least $250-$300 for it. Message me back if you are interested and I will have pics posted up later.
I dont know if you have tried or not but there is a lightbar forum www.elightbars.org they have a for sale section. You will have to register as a member which is free, and you will probably have more luck selling it over there.