A store can stock items that have the same appearance but have different prices. For instance, organic bananas can look like conventional bananas, but can be priced higher than conventional bananas. In some examples, a higher-priced item can be tagged with an identifier, which can include a visual cue that indicates, to the naked eye, that the item is higher-priced. For instance, organic bananas can include tape that visually indicates that the bananas are organic. In some examples, the problem of a person purchasing a higher-priced item at an imaging checkout terminal, but selecting a price of a corresponding lower-priced but visually similar item, can be overcome by capturing an image of the purchased item, determining from the image that an identifier is attached to the item, determining that a lower-priced item is selected at the terminal, and producing an alert for an attendant.