Lots of good info here for prospective buyers.
To add to the info for the Mid-atlantic Northeast Corridor.... It seems that Central Maryland seems to be the sweet spot for prices and deals. The further north you go, it seems the dealers want to tack on a premium price for Challengers, no matter which model you are looking for. Further south, like in Virginia, they still send vehicles out as Demos, and claim they are NEW cars but yet they have 100's or 1000's of miles on them because they were not registered or titled. Be very wary of that imo.
One of the things to look for is whether or not a dealer is considered a VOLUME dealership. Within 40 miles of where I live there are at least 25 Dealerships who sell Dodge products. Some claim to give you the best price.... while the true volume dealer will beat the prices of other competitors. It is very difficult to get things in writing and you have to be willing to stretch the truth a little.. IE: if they give you 500 off, it is automatically 1500 off at another dealer. Also, do not be afraid to ask for other incentives, such as a Mopar cold air intake, Front strut bracer, or other things which you might want to get. They will roll it into the deal for the car just to make the sale.
Something else to consider, the last week of the month, of the year, or the quarter.... is a good time to buy. Additionally, if you see a car you like or want, see how many months they have had it on the lot. The longer it sits, the better your chances are to get a deal.
The above has worked for me with several purchases over the past couple years, and I am thinking of trying to do it one more time and try to score a 392 Challenger.... the hard part for me is getting my wife on board with this... I am at the go ahead buy it and you will be looking for a new place to live stage..... I figure another 4-6 months and I will have her worn down enough for her to say fine go ahead.