Agreed with everyone else. Email everyone, as far as you are willing to buy, and then pit everyone against each other. That's what I did; it gave me the confidence to feel like the price I am (maybe) settling on is a great market price.
For a bit of background, I emailed about 20 or so dealerships around 100 km from me.I ended up dealing with 7 dealerships, which competed for my trade ins and sale price. I found out that new car prices are low (Invoice in Canada for the GT2 is $49,100), but so are trade in values. In fact, I think that next month when wholesalers take stock on how slow the car industry is moving, I expect a big fall in used car prices.
I'm a bit spoiled though, coming from Canada. I'm close to signing a deal here for the Limited, which is really a fully loaded GT2, $49,150... Canadian. That price and 1.9% financing (0.9% if you want 60 months), and first 120 days no interest payments.
At the same dealership, a new 2019 (rare) can be had for 0% financing for 84 months!