Thanks for the info.
I'm not sure why freight forwarders (that's a mouthful; how about we just call them FFs from now on?) aren't located in Delaware or a similar place. I assume they simply chose to locate in larger and more populated states like NY because they expect more business. FFs aren't just for online sales. They probably expect sales from locals, as well, so locating in a city/state that has a large population (specially a large population of foreigners) seems like a good idea. Or maybe they just didn't think of it...
But yeah, I agree that's a good idea. No sales tax would certainly be helpful.