When purchasing anything from +Google Play​​, first check with the tech personnel, Librarian, etc. to see if there's an account for educators. Chances are that they can obtain this for you.

Update: Watch this video https://youtu.be/QYNvQpLaUCc

The other option is #GoogleOpinionRewards for personal use. It's a survey incentive app. The pay is 10¢ to 15¢ on the low end which is usually the case, and you'll never know when you get a higher paying survey. Also, surveys are few at first. However, a Dime at a time accumulates. Soon, you'll get enough Google Play credit to purchase your instructional resources.

Watch this video: https://youtu.be/QYNvQpLaUCc
Photo
Shared publiclyView activity