They are charging you $58.00 each just to change them, you bought the plugs. Did they have a gun to your head? You need to get out of there quick. $350.00 to change 6 plugs is some kind of a crime.
2012 Sport Auto 3.73
ACE rock sliders, Warn M 8000 with synthetic rope
Eaton Trutrac Front and rear
17 inch ATX Ledge wheels on 285/70/17 Duratrac
Cheap is never a good thing when it comes to your Jeep