Does it matter which camera shop I buy it from?
Oh, Lordy, YES!
When I bought my Panasonic, I spent hours combing the internet looking for the best buy. What a waste of time.
The main thing I discovered is that the internet camera gear sellers are, for the most part, crooks and lying thieves. I am sure there are glowing exceptions, but none that I found. I have no first-hand experience with B&H, so will accept the praises offered by the people here. Amazon is the "poster child" for how to run an internet business; you will
never go wrong buying from them. But as Dan Wallach says, make sure you're buying from Amazon direct and not one of their subsidiary merchants, although I suspect that Amazon does a pretty good job of policing their associates.
What I learned from my experience is this: Pay the extra $100 or whatever and deal with a merchant you know from personal experience (or advice from a trusted friend) is honest, honorable, accommodating, and repeat-business oriented.
tanstaafl.