Try one of those toursit trap type shops that sell tourist stuff....
or you can do what the natives do, whenever they need a new set of plates...... But you'll have to bring your own screwdriver.If you are lucky enough to get to travel along the "Cross Bronx", you'll be able to find an assortment of "missing in action cars"... if you need any parts, but unfortunately the plates will have disappeared way before you got there. (I could tell you a story about a disgunted employee, and what he di with a company truck... and no it wasn't me....)
Of course, in the right neighborhood, here by refer to as "the hood" the locals would be happy to get you all the plates you need for a small fee. These locals can usually be found at the local watering hole. Of course you may have a problem explaining the plates passing through customs..... :-) :-) :-)
PM me, I'll give you my phone number, and if you get a day free, I'd be happy to give you the tour of northern NJ hobby shops...... (If I can find missing Pvt Parts, I'll drag him along also) at last count there are no real hobby shops left in the big apple.
Character is what you do when no one is looking.
Few things are harder to put up with than a good example.- Mark Twain
Make yourself an honest man, and then you may be sure that there is one less scoundrel in the world.--Thomas Carlyle