Amazon has announced that starting on April 1st, 2017 they’ll begin collecting sales tax in 45 states many of which have already been paying taxes on their purchases, so this isn’t a new thing for everyone. This change will exclude Delaware, Montana, New Hampshire and Oregon which have no sales tax. Yay Oregon!
So I suppose if this is going to be a new change for your state, you might want to get a little bit of shopping in before the 1st!