I decided to be nice and put this here because nowhere else on the web really gives hard prices for the install:

Hifi Buys/Tweeter - Kennesaw, Georgia - 5-8-03

1 Alpine MXPT130 240W 2x50W HP/LP - $119.99
1 JL Audio 8" subwoofer 75W 4 Ohm - $79.99
Subwoofer Labor - $54.99
Amplifier Labor - $50.00
1 100W Amp Power Kit - $19.95
Misc. Labor - $19.99
Labor Mobile Installation - $15.00
Installation Materials - $5.00

A grand total of $377.16. It sounds great and vibrates the mirrors when cranked. Keeps up with the stock trebles and mids. Doesn't vibrate other people's cars but you can definitely hear the bass outside of the car. I have already blown one of the front speakers cranking the bass from XM66 Raw...