Went into the app and found the offer waiting for me, and tapped redeem! Limited to the United States, sorry. If you are like me and your library is split over all the major ebook platforms I'm sure you'll find a use for it.
https://goo.gl/photos/6Mq6YN4TsJ6AhWga6
Image imbed didn't like link to google photos
Edit: Gah, title should have said "any" not "and", If a mod cares to fix it? No big deal.
Edit, again, thanks for fixing that tubemonkey!
Also, noticed that I could redeem the offer on both my google accounts!