If you are looking to earn a little extra cash while already shopping, check out Receipt Hog. You do your shopping as usual, then upload any receipts you don’t mind them seeing. They reward you with coins and sometimes surveys. The coins can then be redeemed for cash or prizes.
You may ask, why would someone pay for your receipt images. The send the confidential information to companies for evaluation on what people are buying and trends. They use it to understand the consumer better.