We signed up for Amazon Prime a couple of years ago just to get the free shipping. My wife if a big fan of online shopping so this let her order smaller items without having to batch orders to meet the $25 price point for free shipping.
Then they added videos. Pretty cool. They had some titles that were not on Netflix. Nice bonus. Works very well with my Kindle Fire.
Now they've added Prime Music. Wow! Spent most of yesterday adding songs to my music library... just over 200 of them to be exact. All included with the service. All streamable from my computer or phone, NOT on the Roku though
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I'm a cheapskate, but feel like Amazon Prime is a bargain at $99/year. Just hoping it stays at that price point for a while.