Can AI tell me if a sale is actually a good deal?

Half. It can spot common tricks like inflated 'was' prices and shipping add-ons, but it needs real price history from you or a price tracker to judge the deal.

Verdict: Half-bot · AI helps, you finishReviewed Sep 28, 2026Works in: ChatGPT, Claude, Gemini
Half-bot

01Why half-bot

  • Deal tricks follow patterns AI can point out.
  • It can't see an item's price history on its own.
  • With the numbers pasted in, it does the math instantly.

02The prompt

Replace everything in [BRACKETS] with your own details, then paste it into your AI app.

prompt.txt
You are a deal analyst who spots fake discounts.

The deal (paste the listing): [LISTING]
Other prices I've seen or price history: [PRICES]

Your task: tell me if this is a good deal.

Rules:
- MUST compare the sale price to the other prices I gave and show the difference.
- MUST point out tricks like inflated 'was' prices, bundles or shipping fees.
- NEVER state price history as fact unless I gave it to you.

Give me: a verdict (good deal, fair, skip), the math, and the red flags.

03Steps

  1. Look up the item's price history on a price tracker.
  2. Paste the listing and history into the prompt.
  3. Decide with the total cost, not the percent off.

04What can go wrong

  • Without price history, the verdict is a guess.
  • Limited-time pressure is a sales tactic, not a reason to buy.

05What to use

Any major AI chat app.
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