Google have put up over a hundred books for sale on the Play Store.
You can choose from a variety of Books from Authors like David Lehane, Will Hobbs, Jodi Meadows, Catherine Fisher, etc.,
Just head over to this link to buy the books you like. The price of the each book varies, but the starting price is $1.99.
Unfortunately this offer is only for U.S. residents only. You could try using a VPN, but there is no guarantee that it will work.