i use these all myself!

earn via surveys, games, tasks, videos, music

• swagbucks
• gift hunter club
• perks
• whaff rewards: use refer code em62277 for $0.30

lockscreens (ads show on lockscreens and you get paid for it)

• survey cow - use refer code zh6rew for extra points. it will ask you a question on lock screen.
• whaff locker - use refer code em62277 for $0.30, though i recommend downloading whaff rewards first and then downloading locker from there, you'll get extra money
• slidejoy

earn while you search google/ebay/amazon