I stumbled upon the perfect duo: Google Opinion Rewards and Google Play Books. Earn Google Play credit using Google Opinion Rewards and then spend the credit in the Google Play Books store to get a deal on any eBooks you want to buy.
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- Download the Google Opinion Rewards app on your smartphone. Use it to answer very short surveys in exchange for Google Play credit. I really do mean short, by the way. Typically I will spend about 15 to 30 seconds on a single survey and each one can be worth up to $1.00.
- Spend your credit in the Google Play Books store!
Lately I've been reading faster than I can earn credits, but I'm still getting discounts on every book I buy. It's a very low effort way to get discounts on eBooks while still purchasing them legally.
Of course you can use your Google Play credit for anything in the Google Play store, I just happen to be interested in using it for books specifically.