I just received an email advert that says, "Nikon Cameras, save up to $600 while supplies last."
A closer look at your ad never mentions the Nikon rebate. You claim that the savings is courtesy of COSTCO, nothing could be further from the truth.
That's NO BARGAIN AT ALL!!!
Nikon prices are not discounted ever; unless they are grey market. Nikon however offers rebates, which is what your pricing is. A look at one of the most reputable camera stores on the Internet and in brick and mortar is B&H Photo Video in Manhattan. They are offering the same package and spell out the $100 instant rebate.
This must be what everyone calls BS advertising.
COSTCO you ought to be ashamed of this practice.