Ive and my room mate has been screwed over by walmart. Charged twice for single purchases. Charged more than the sticker on the shelf said. Then once in a while purchased something with an expiration date that had passed.
Now at one of my old jobs was a food truck that came by and had a guy and his wife who spoke little engrish. Every day his prices changed. Some days we got back more in change than you handed him.
Some days we told him to keep the change.