Do you file for your sale tax id in each state or do they do it? Not having to have a presence now causes the need to get a sales tax Id anywhere you ship a product.
I have them autofile for my state i have a presence in currently, which is nebraska. Amazon autofiles for me for other states as they collect it. i need to circle around with my accountant to see what he wants me to do with these other states. most likely i will probably have taxjar.com autofile states where i meet the thresholds.