I agree that the state sales tax on purchases from out-of-state companies is improper, but I don't understand your statement. The "they" that setup the economic stimulus is the federal government, and the "they" that is collecting the sales tax is the New York state government. There is no connection.
Well u are right in that they are 2 things as federal and state. But I'm sure they both benefit from the economy doing better. So I think it would be better for them to work together rather than counter acting what one has done. So when I say they, I mean the government as a whole. Not federal, not state, but as a government that should be working with each of its parts to better the country as a whole.