I almost always buy at B&H Photo in New York. I order over the internet, but they are a "bricks & mortar" store. Photogs use that designation to let you know that they have a "real" store you can walk into, as opposed to some businesses that sell ONLY over the internet and can be kind of shady.
Anyway, B&H is just about the biggest, most trusted store in the photo business. They are professional, safe, and usually have the best prices.
B&H Photo Video | Digital Cameras, Camcorders
Other stores I trust are Adorama
Digital cameras, all other cameras and everything photographic from Adorama Camera and locally, Tempe Camera
Tempe Camera - Buy, Rent and Repair Photography Equipment
I think it's great to support local photography stores like Tempe Camera, but then again I also like to save $$ and B&H often has a better price on what I need, at least the big items.
Good luck!
Jennifer