supercharged 5.7 hemi?

I'm looking into this,From what i can tell I'd like to get the mod man from Indy and take it to dyers and see how much they would charge to build a blower to adapt to the mod man and stick a carb on top--Steve---When you look into pro chargers and others centrifugal style I just don't see why they are so much money--the super charger store wanted to sell me a set-up for $6800.00 and my reply was HUH???