http://www.bloomberg.com/news/2014-04-22/amazon-sales-take-a-hit-in-states-with-online-tax.html
http://www.avalara.com/blog/2014/04/24/online-sales-tax-impacts-amazon-how-far-will-you-go-to-avoid-tax/
http://www.salestaxdatalink.com/amazons-sales-tax-advantage/
Amazon's sales go down when they start charging taxes. Well, duh! Is this really news to anyone? I hope no government funds were wasted to do this study.http://www.avalara.com/blog/2014/04/24/online-sales-tax-impacts-amazon-how-far-will-you-go-to-avoid-tax/
http://www.salestaxdatalink.com/amazons-sales-tax-advantage/