I haven't any experience with A&M, but I did have a bad experience with AAA. They told me that the F100 they advertised was US Market but then I found out it was Grey Market ... and defective! It was amazing to be lied to so blatantly as these SOB's. Fortunately, I had purchased the camera with American Express and contacted their Customer Relations department. They asked me if I had tried to resolve this through AAA and I informed them that I had. They started an investigation, assigned it a number, and got on it. I sent the camera back. AMEX got me a full refund.
My advice: 1. don't buy from any but a reputable online dealer. Samy's. B&H. Etc. Usually their prices are higher but so is their quality and backing. 2. Don't buy grey market cameras ... too complex and as BJ points out, Nikon won't touch it. In fact, some good camera stores won't touch them either. Grey market lenses and film are probably okay. 3. Use your credit card company as a resource if you have a problem. They will advise. These rip-off artists don't want to lose their credit card sales.