## 12. Compare With Your Local Grocery Store
Even if you love Costco, it’s worth checking supermarket prices occasionally.
Grocery stores frequently run promotions, loyalty-program discounts, and temporary sales.
A sale can sometimes narrow or eliminate the price difference between warehouse milk and supermarket milk.
If you already shop at multiple stores, comparison shopping doesn’t have to be complicated.
Check the price per unit and compare similar products.
Over time, you’ll get a much better sense of whether Costco’s milk is consistently a good deal for you.
