Until January 4th as part of the winter holiday sales, the Moon+ Reader Pro app is 50% off for just $2.49 USD or local equivalent @
the Google Play store, for anyone who happened to get a first-time Android device recently or knows someone who does and might want a decent reading app.
They also sell it in the Amazon appstore, but it doesn't seem to be discounted there. More details about the difference between the free and the paid version can be seen on
the official website.