The best way to research prices is to use www.cycletrader.com. Narrow your search to dealer, nationwide, and new 2013 Yamaha
WR450F. I found 120 motorcycles that matched these search criteria.
Some of the better deals, included MichaelWR's deal in Ohio for $6,498 out the door. By the way, this ad said + destination charges, but that is also a BS charge. There were numerous other bikes offered for a few hundred dollars more than this price that where located closer to a seaport, thus making your shipping costs less. I would say that MichaelWR's deal of $6,498 out the door is by far the best deal I saw on Cycle Trader.
There was one deal located not far from me at Temecula Motorsport, in Murrieta, California at $5,999. However, there was the additional information included in the ad that this price did not include setup, destination and licensing fees, as well as state sales tax. While you could probably eliminate some of the fees at Temecula Motorsport, you would have to ship the bike across the country to get to an East coast port for shipping. These are numbers to pay with, go out and buy a new bike.
Remember, ask to speak to the Sales Manager or Internet Sales Manager. Don't be afraid to negotiate, you will know when your offer is too low, it is when the Sales Manager lets you walk out the door or hangs up the telephone.