I was quoted $305 in omaha NE to have the following installed in my 02 cougar:

Empeg, 4 chan amp, 4 speakers, powered sub.

That was including all the power wiring, audio wiring, and adapter plate for the empeg. So I figure it was just under $200 for the labor, which isn't bad considering how much work is involved.

I'm contemplating if I want to do it myself so I can build an enclosure thing for my trunk to mount everything on, that way I can just lift it out when I get rid of the car and keep my amp/sub. The biggest problem I have is it's going to be REALLY cold out side soon, and my garage is narrow and unheated. Anybody in the omaha/lincoln area have a garage I can use? I know one of the big empeg hackers lives in lincoln someplace...