My friend purchased a Cartier tank francaise watch from Saks in Las Vegas and they gave her a 10% discount just because she asked. I think it was because she went to the Cartier store and they offered 10% off and she asked if Saks could match that, and they said they would.
I think if you order from an out of state Saks and you are not shipping to NY, you should also be able to get it tax-free. If you purchase during EGC time, you can get a $450 gift card for purchases over $3000. And if you open a Saks card it's another additional 10% off. So with all those discounts, I think you can get the watch for a pretty decent price.