3.76€. In general food is much cheaper than in France, except for imported PDO (AOP) food and some common French fruits that are sold as luxury here. For example Comté is 5€30 for 100g, melon can be 30€ for one.
Those are pretty common in most European countries I've been to too, though often more monochrome. They just seem like less of a hastle than paper tags, if properly implemented.