I don't dispute you can spend $1.40 on a can of beans if you're buying premium brand, but in Asda (a British supermarket chain brought by Wal-Mart a few years ago) I can buy a can of "SmartPrice Baked Beans in Tomato Sauce" [1] for £0.24 (about 33 cents) and a can of "SmartPrice Mushy Peas" [2] for £0.16 (about 22 cents), and a can of "SmartPrice New Potatoes in Water" [3] for £0.15 (about 21 cents).
If you can get those goods onto shelves profitably and spare a cent for an RFID tag, you could have a successful career in grocery retailing :)