## 1. Start With the Price Per Unit
One of the biggest reasons shoppers buy milk at Costco is price.
Warehouse stores are designed around bulk purchasing, and milk can sometimes be priced competitively compared with conventional supermarkets. However, looking only at the total price on the shelf can be misleading.
Instead, compare the **price per gallon, liter, or other unit**.
A large container may look expensive because you’re paying for more milk at once. But if the unit price is lower, it could still represent a better deal.
On the other hand, a sale at your local supermarket could occasionally make smaller containers competitive with warehouse pricing.
That’s why smart comparison shopping involves checking the actual unit price rather than assuming Costco is automatically cheaper.
Prices can also vary by location, product type, package size, and promotions, so what one shopper considers a bargain may not be the same deal available at another warehouse.
