I bought last week in NOVA. I wanted a limited trim with the sunroof and advanced safety and there were very few left and they were being sold either before I could get to the dealership or after I test drove but before my husband could get there. It sucked. I finally bought from Browns in Sterling - they actually drove one from Bowie to their dealership to sell to me - and they have me a much better price than the Bowie dealership was offering on the same car (by about $3k).
If you are looking for a lower trim level, just start emailing around, ask for OTD prices and ask someone close to you to beat it or match it and buy it. If looking for the limited, multiple dealers told me that they sell 90% of them before they even arrive on the lot (as I did) but the lower trims barely move.
And some had different dealer/manufacturer incentives. For example, in June, many had 0% APR on new 19s but some dealerships did not.