For a limited time and apparently limited to those not using a Google Apps account (that will be a small number of you), you can rent any movie on Google Play for just $0.99. That includes 4K rentals, too.
To redeem this offer, simply open up Google Play on your phone or desktop, find that red banner near the top (like in the image above), hit the Redeem button, then you’ll then see all rental prices, 4K included, drop to $0.99.
We’re not sure why Google Apps accounts aren’t supported, but when switching to our own personal accounts, redeeming the promotion works just fine.
Have at it!