One of the best places to buy any professional equipment is B&H Photo in New York City. They have a great reputation, and are very professional. They are also an official Panasonic Authorized Dealer. I bought my DVX from them. They're not the cheapest, but they have the best bang for your buck. With the $500 rebate Panasonic's offering, you can get the camera for just under $3000, and then go ahead and get your extended warranty. They won't hassle you to buy accessories and other things. They also have a great used department.
Beware of the Brooklyn-based camera shops. Sure, they might offer the camera for a really low price, but they almost always are scams or ripoffs, and they can be very rude. The camera will almost never be much lower than $3000 before the rebate, and if it's a real U.S. camera with a real U.S. warranty, they will always offer the rebate (unless it's part of a package deal). The cameras these guys offer usually are grey or black market, and come with no warranty and no support...and sometimes no accessories.
You've been warned. :-D
-Chris