Looking for ballpark figure or estimate for install of parts
 

2007 Cadillac CTS base
2.8L V6

I will require an install of:

6 spark plugs
6 ignition coils
4 oxygen sensors
2 Direct-Fit catalytic converters

Does anyone know what I could be looking at in installation costs, etc. and/or knows the cheapest way(or company) to have it done? I am in New Jersey. Please advise.