Need advice on 370z shopping

[Notez_370z]

Ok so I've had my account for awhile now but I've just used it to gather information on the 370z and learn as much as I can before I get my own. Finally I'm ready to pull the trigger and get one in may I'm looking at an all
black 2013-2015 model which must have the sports package. I've located some good dealerships that have the car I want but I'm always looking for the best and lowest price as possible. What are your thoughts on Carmax ? Because they seem to have a larg inventory and fair prices and I would prefer getting it used instead of new because of the immediate depreciation. Thoughts,advice, criticism is welcome. Thanks again for everyone's time.