here is my chart....
HU- $25.00 (depending on whether I have to hardwire it, it can go up to 35)
Amp/Subs- $65.00
Amp/Door Speakers (4)- $75.00 (this includes running NEW speakerwires) I will do the old, connect the rear speaker wires to the fronts behind the HU and run new wires for the rears trick...and that will drop the price down
Full system (all of the above)- $115.00
I can get this all day long in Baton Rouge LA, but back home prices drop because of the clientel. Basically, you tell the person you get what you pay for, I see 10.00 HU installs come in the shop all the time, hacked together with duct tape and coat hangers. You have to pay for quality