Amazon has a history of acting that way. I think they did that in New York and then they backed off and reversed themselves so I’m not sure we should take that too seriously. I have my own way of dealing with it, which is I just won’t deal with Amazon.
Check out Binkers's post and don't forget to listen to the audio, which includes a discussion of taxes in general. And while you're at it, please join me in boycotting Amazon.