The Amazon App store is the second most popular app store on Android, however unless you have a kindle it does not come pre-installed. Take a look at the video and the links below to install it!
Amazon App Store Download: https://www.amazon.com/gp/mas/get-appstore/android/ref=mas_gs_mbl_redir
How To Do Tech Tutorial: http://howtodotech.com/blog/2013/4/4/how-to-install-the-amazon-app-store-on-android
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