There is an app called "Receipt Hog" which allows you to take pictures of your shopping receipts with your smartphone and gives you points for doing so. Points can be redeemed for Amazon gift

Just redeemed £3 Amazon Gift card on Receipt Hog. Have receipts lying around? Get paid for them! DM me to get started with 40 coins #receipthog #couponsavings #saturdayearned #share2steem kingsavvysaver

My battery is low from snapping receipts 😛 Eligible for an Amazon Gift card, however I’m aiming for the £50 :) 😀🎄 #amazongiftcard #receipthog #receipthog #share2steem kingsavvysaver Posted from Instagram

Save all your receipts, install this app, snap a picture of your receipt, submit it, get points, win rewards! You can choose prizes from amazon cards, PayPal, etc. It's useful, easy, and fun. Play Store