Google Play $3 e-book credit toward ebook over $3

I just received an email from Google Play titled "Your sweet surprise awaits..." with a link to claim a $3 credit on any ebook over $3. Valid through Feb 15.

-->edit: Alternatively, there is now an ad for the promotion in the top banner on the main landing page [google.com]: "Get $3 off any book over $3: A Valentine's Day treat for you."

Here's a link to the offer page, but I'm not really sure if that'll activate it for you, or what: https://play.google.com/store/boo...7246556098

Trying to find something inexpensive that I want and I came across some books I'd recommend, that aren't expensive:

Hyperion [google.com] - Dan Simmons (book 1 in a series)
Children of Time [google.com] - Adrian Tchaikovsky
Girl, Interrupted [google.com] - Susanna Kaysen
Trigger Warning [google.com] - Neil Gaiman (haven't read this, but might be the one I get)
The Dispossessed [google.com] - Ursula LeGuin