B&H is now collecting tax for sales to customers in states that have post-Wayfair tax laws enacted, which is around 3/4 of the states.
Most of the states that have not yet done so will be doing so soon. California's goes into effect 2019-04-01, so those of you from California have until then to get your tax-free online shopping done.
Here's a page with the status for each state [2]. Here's another useful page [3] with per state info.
[1] https://en.wikipedia.org/wiki/South_Dakota_v._Wayfair,_Inc.
[2] https://taxcloud.net/topics/States%20News%20and%20Informatio...
[3] https://www.avalara.com/us/en/learn/nexus/find_your_nexus.ht...