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You Should Definitely Be Buying These Things At Costco

3. Cleaning Supplies
Cleaning supplies are another must-have that anyone can purchase at Costco, regardless of the size of your household. Everyone needs cleaning supplies, right? And they don't have an expiration date, so buying a larger package isn't a bad thing. In fact, it's better for the environment than buying small packages more often.

You can find cleaning products like this Simple Green All-Purpose Cleaner for a bargain. This online offering is for a 32-ounce spray bottle and a 140-ounce refill — all for just $9.99.