As Charles said, the price does vary depending upon the work needed. While obviously these are new cars...unfortunately there are situations where damage (swirl marks, water spots etc) is done to even new vehicles while either in transport...or once they arrive at dealerships (allowing your car to be washed at a dealership is one of the quickest ways to mess up the paint.)
If you haven't received your C7 yet I usually advise customers to ask the dealership to NOT wash it when they receive it. A rule of thumb is, the sooner you can get it to your own personal detailer/CQuartz Finest installer..the better. Finest not only looks awesome, but has many other attributes (scratch resistance, bird bomb etching resistance, chemical resistance, self cleaning properties etc) that will help to protect your OEM paint and make maintenance MUCH easier.
Be sure to get proper care instructions after the detail/Finest application from your installer. Something as simple as proper wash techniques along with some quality microfiber towels and wash mitts can save you a LOT of trouble and keep your ride swirl free for much much longer.