Surprised no one mentioned BB.
B&H and Amazon for all of my lenses and accessories.
Best Buy (no tax in NH, 30 minutes drive) for my Canon EOS 20D, and 5D Mark II bodies.
Best Buy sells camera bodies at MSRP, and I got 24 month 0% financing on BB Card for both camera body purchases. 2-3 weeks ago IIRC, they had 36 month 0% financing for any digital cameras purchases over $699.