Opens location 12/16/16.

http://www.denverpost.com/2016/12/19/amazon-opens-first-store-colorado-pop-up-companydevices/

Announces will collect sales taxes everywhere.

http://money.cnn.com/2017/03/29/technology/amazon-sales-tax/index.html

Largely because their model expanded into every state if you read the article.  

http://www.denverpost.com/2016/01/15/amazon-to-collect-colorado-sales-tax-on-purchases-starting-feb-1/  

Coincidentally that was the day they purchased land to build a center in Aurora
http://www.aurorasentinel.com/news/amazon-bringing-massive-warehouse-aurora/