Did you know that it is possible to receive cash back on your in-store grocery shop? There are shopping apps that will reimburse you in full when you buy selected groceries. Best of all these shopping apps are completely free to use! Shopmium is one such shopping app and it is a fantastic way for you to earn some extra cash just for completing your food shopping. I have personally written about ways to earn money on your food shopping before. I have written about CheckOutSmart before.