Costco is the land of bulk bargains, but even die-hard warehouse fans know: not every oversized product is a smart buy. Some items are pricier than they seem once you compare them to other retailers, while others are just plain impractical for smaller households. After crunching the numbers and dealing with some real-life frustrations, here are 8 items I avoid at Costco—and what I buy instead.
1. Ziploc Sandwich Bags
Why I Skip It:
Costco only carries name-brand Ziploc sandwich bags, and they come at a premium. A recent price check showed they cost around 10% more than Walmart’s Great Value version—and the difference gets worse for larger or specialty sizes.
What I Buy Instead:
Great Value Sandwich Bags at Walmart: cheaper, reliable, and available in multiple sizes.
2. Frosted Flakes & Other Brand-Name Cereals
Why I Skip It:
While Costco’s big boxes seem like a deal, stores like Aldi and Walmart offer house-brand dupes for much less. I’ve compared prices per ounce, and Aldi almost always wins on value for popular cereals like Frosted Flakes, Rice Krispies, and Shredded Wheat.
What I Buy Instead:
Aldi’s private-label cereals or Walmart’s Crunchy Nuggets (aka Grape-Nuts knockoff).
3. Manual Toothbrushes
Why I Skip It:
Costco doesn’t offer a wide selection of manual toothbrushes—especially those approved by the American Dental Association (ADA). If you’re picky about oral hygiene tools, you’ll likely strike out here.
What I Buy Instead:
ADA-approved manual toothbrushes from Target or Walmart, where I have more variety and better value.
4. Suave Daily Clarifying Shampoo
Why I Skip Costco Shampoo:
Costco’s Kirkland Signature Moisture Shampoo is great quality—but it’s several times more expensive than my $2 bottle of Suave at Walmart. It’s a no-frills formula that gets the job done.
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What I Buy Instead:
Suave Daily Clarifying Shampoo (30 oz) at Walmart for unbeatable value.
5. Shaving Gel
Why I Skip It:
I have sensitive skin, and Costco’s shaving gel selection is limited. I need a formula that’s gentle and lightly scented—and I haven’t found that at Costco.
What I Buy Instead:
Target’s Up & Up Therapeutic Shave Gel, which costs just $2.69 and lists fragrance near the bottom of the ingredient list.
6. Trash Bags
Why I Skip It:
I need 25- to 30-gallon bags with drawstrings, and Costco’s Kirkland 33-gallon version just isn’t the best value. Aldi’s Boulder brand offers similar durability for 13% less.
What I Buy Instead:
Boulder Trash Bags (30-gallon, drawstring) at Aldi.
7. White Vinegar (1.32-Gallon Jug)
Why I Skip It:
Costco’s price per ounce is great—but the jug is just too much. Lugging it, pouring it, and storing it is a hassle. Smaller jugs are easier to handle and nearly identical in price per ounce.
What I Buy Instead:
1-gallon jugs of white vinegar from grocery or big-box stores—no mess, no muscle strain.
8. Kirkland Signature Laundry Detergent
Why I Skip It:
I used to swear by Kirkland Signature Free & Clear, but the giant container eventually wore me down. It’s heavy, leaks sometimes, and hogs shelf space.
What I Buy Instead:
Puracy Concentrated Laundry Detergent—compact, clean, and lasts just as long.
Final Takeaway
Costco has a ton of great deals, but even the best warehouse club can’t win every category. When it comes to items like cereal, sandwich bags, shampoo, or detergent, don’t let bulk packaging blind you. Take a few minutes to compare unit prices or consider convenience—you might be surprised by how much you save elsewhere.
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