I purchased my D600 from Best Buy with no difficulties. I am a reward member and thought why not get credit for the purchase. Plus, none of the camera shops in my area had any in stock. When they reduced the price by $100, I took my receipt back and got the credit.
I have a little dust, but not enough to warrant wet cleaning at this point. I will try a blower first and wait for more shutter actions. I am at about 1,000.