Is formula cheaper at Costco or Walmart?

Usually, Costco is cheaper on a unit-price basis for baby formula, but not always. The exact answer depends on the specific formula, package size, promotions, and whether you’re factoring in a Costco membership.

A practical rule of thumb:

• Costco often has a lower price per ounce on bulk formula, especially for larger packs.
• Walmart often has a lower upfront checkout price because it sells smaller containers and has no membership fee.
• If Walmart is running a rollback, clearance, or bundle deal, it can sometimes match or beat Costco on unit price.

Best way to compare:

1. Check the price per ounce on the shelf tag or product page.
2. Include any Costco membership cost if you’re buying there just for formula.
3. Compare the exact formula type you need, since prices vary by product.

So, if you mean overall per-ounce cost, Costco is often cheaper; if you mean cash needed at the register, Walmart is often cheaper.