Google Play Store app is offering 100 points (worth $1) for completing 4 simple steps (quest). The offer is available on Play Store app (I didn’t see when using desktop browser).
Steps:
1. Start this quest
2. Spend $1 or more
3. Claim a weekly reward
4. Use some points
This ad was on my and wife’s android phones.
YMMV
https://play.google.com/