“Dear Amazon.com Customer,

We recently lowered the price on an item you purchased: “Undun” by the Roots. Because we want you to benefit from the new price, we are sending you a $4 credit good for music downloads at Amazon MP3.

Here is your promotional code: XXXX-XXXXXX-XXXXXX

Visit http://www.amazon.com/mp3credit for redemption instructions and see below for additional information.

The credit must be used by January 9, 2012.”

Well, this is simply an awesome policy.