Add Yahoo as a preferred source to see more of our stories on Google. A person nears the end of an aisle in a Costco store - Tada Images/Shutterstock As it turns out, a yellow circle sticker is a ...

You're pushing your giant cart through the massive aisles of Costco when you see a price tag with a yellow circle sticker on it. Did you just stumble across secret savings, a special markdown, or even ...