A few months ago I preordered a video game, upon receipt of the game months latter I also received an email that stated that Amz had lowered the price of the game in the time span of between my preorder and delivery of the game. They issued me a refund for the difference. It was something on the nature of .03, but impressive none the less.

A few months ago they went back through all the physical books I have ordered over the past 10 years and gifted me electronic versions of a subset of them.

They did the same with all my music purchased physically a few months previous.

I have never dealt with returns or the like with their customer service, but the channels in which they can deliver (physical + digital) is perfect for the time period we are currently in as physical mediums start to fall off.