Look on the Ritz site. There is New, with Nikon USA Warranty, and there is also "gray market" with only third-party warranty service. Nikon will not repair USA gray market items in the USA repair chain.
Warranty and "extended warranty" is where retailers make their money, and where gray market rertailers clean up. You need to simply ASK, or better yet, read in-print, what you are buying.
The "lowest price" on something is different from "the best value", or even "regular level of value". There is new with USA, new gray market, refurbished, and also used equipment. Warranties are not always transferrable to a sewcond buyer--even though sellers on e-Bay or Craigslist will say, "Has two years warranty remaining!" and so on...that's not a given that such coverage will be recognized. And in fact, REGISTRATION of new-USA warrantied items has been the way Nikon has given its longer 5- to 6-year warranty type coverage; ONE year NEW, and then extended coverage only on items that were registered with Nikon by the original buyer.
Look in to a Cameta Camera refurb item if you need to get the price low. Do you even need a warranty? I typically think no, you do not. But some people want one.