Amazon has created a program where your purchases at Amazon can support your favorite non-profit. This program is called Amazon Smile and MetaBrainz is enrolled in this program. If you would like to support MetaBrainz (and thus MusicBrainz), start with this link when you start shopping:
Alternatively you can bookmark this link:
We’ll be integrating links to Amazon Smile into the MusicBrainz web site soon, so you won’t have to remember these links.
UPDATE: This only works for the US based Amazon store.