I bought mine from Adrenaline Powersports in California for $1000 less than MSRP. Prices in the midwest can be as much as $500 less, because of reduced shipping cost. None of the dealers on the west coast will match midwest prices, they would be losing money.
Most dealers don't make any money selling sleds, they sell them because it attracts customers, and because Polaris makes them sell a certain number every year to keep their franchise.
If you are negotiating a deal it would be better to not question their price on the sled too much, unless it is way out of line. Ask if they'll give you a discount on future purchases, you'll probably save more money that way.
If the dealer is making less than $500 on a sled, it is hard for them to offer you a meaningfull discount.
If you want a great deal on a '13, wait until this time next year, when Polaris starts offering holdover discounts.
Bill at Adrenaline is great. I would have purchased from him If I lived in the area!