When buying in bulk, there’s an implied promise that you’ll pay less per unit than if you bought a smaller amount. That’s one of Costco’s strategies to generate profits—offering deals to its members.

However, sometimes that promise is broken. It must have happened to you at least once: you look at a “family size” box of cookies or cereal at the grocery store only to discover it actually costs more per ounce than purchasing a smaller container. So it’s a bit deceiving to know that buying in bulk doesn’t always save you money.

At Costco, the chain that holds the monopoly on bulk purchase deals, some products are more costly per unit than regular-sized products. Others are comparably priced or cheaper but will likely expire before you can eat or finish them. Still, others are sold at a low price but fall short regarding quality.

So, we’ve done a bit of research and found out which products are actually more expensive at Costco. Much to our surprise, we realized that buying Kirkland products in bulk from Costco doesn’t save you any money! In fact, you end up paying more than if you were to buy those items directly from Kirkland.

To help you make the best decision, here are 7 products you may want to skip while bulk buying at Costco.