1. Laundry Detergent

Prices per ounce for huge tubs of dish soap, laundry detergent, and other cleaning products are usually lower at Costco than at Walmart, Target, or Amazon. However, the stuff in those giant Costco containers has an expiration date.

Unopened cleaning supplies (such as detergents) have a shelf life of between nine and 12 months. Once you open them, they are good for only about six months. Moreover, if you use laundry powder in an environment with high levels of humidity, the number is even lower.

Buying laundry detergent from Costco is a great idea for large families that wash many clothes. Also, if you only live with your spouse but both of you workout a lot, going for the Costco option may be ideal. But if you use detergent more slowly, you will either waste money or have dirtier clothes.