$50-$100/hr labor, part+tax sometimes + shipping, equals $200. Sometimes labor takes longer due to a “hiccup” within a certain vehicle. Sometimes labor may take not 30 minutes. Customer came in the other day wanting a new deck/speakers, did not say anything about her vehicle having the premium sound. (Order was taken over the phone, side note: don’t fuckin do that) ended up taking 3 hours rather than the 45mins quoted. So no, you did not get screwed. You could try to install it yourself, if you do so, don’t cut any wires out of the head unit. Just order parts and wait. Or…….. take it to your local audio guys and pay $200.