3. Organic Milk

If you don’t eat meat and dairy or you simply like the plant-based alternatives to milk, you’re probably buying organic milk weekly when you do grocery shopping.

A three-pack of cow milk is usually an excellent deal at Costco, but plant-based milk is less reliably affordable. We did some research and discovered that a three-pack of Kirkland Signature 1% organic milk at Costco costs several bucks more than three single-gallon milk containers at Target.

This often applies to soy milk, almond milk, and similar options beyond 1%, 2%, and whole milk. When you think about how quickly milk goes bad (whether it’s regular or organic), you realize you’re usually better off not buying this product in bulk.