#18
of 44 stores measured
The index › the United States › Party supplies › Costco
Costco in the Krillo Index
When shoppers in the United States ask ChatGPT and Gemini where to buy party supplies, is Costco named? This is the answer from our latest monthly measurement, November 2026.
2/35
buying questions where AI names it; the category median is 1
1
questions where AI recommends it outright
Measured with ChatGPT and Gemini, the same questions for every store in this category, asked in the language of the market. Read how we measure.
Around Costco
See the full ranking for Party suppliesWhat AI says about Costco
“Costco / Sam’s Club, larger outdoor decorations, candy, and multipacks; selection varies by membership and season.”
ChatGPT, asked: Where can I buy Halloween decorations and costumes online?
“Best if you have a membership: Sam’s Club or Costco Often unbeatable for food, drinks, large packs of paper goods, and some party supplies.”
ChatGPT, asked: Which US website offers the best value when buying supplies for a large party?
“If you are hosting a large casual party / BBQ: Go to Costco / Sam's Club (in-store/online) for food and paper goods, and Amazon for decor kits.”
Gemini, asked: Which US website offers the best value when buying supplies for a large party?
Quoted word for word from the answers in our measurement. What AI says about your store decides which buying questions it names you for.
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