FOR EVERYDAY FACEBOOK MARKETPLACE SELLERS
You Know How to Sell on Marketplace. Now Meet Your Selling Partner.
What if ChatGPT could help you figure out what your things are worth, choose the best photos, set the right price, help you negotiate with buyers, and suggest what to do when an item isn’t selling?
I’ve sold more than $25,000 worth of things I already owned. Along the way, I’ve learned how to use ChatGPT as a selling partner—not just a tool for writing ads.
Now I’ll show you how in The 15-Minute Marketplace Playbook.
Just $19.99 USD · Downloadable step-by-step guide
FROM SELLING ALONE TO SELLING WITH A PARTNER
I Used to Make Every Selling Decision Alone.
For years, I did everything myself.
I identified items, researched prices, chose photos, wrote listings, and dealt with buyers…. It worked.
But whenever a buyer made an offer or an item wasn’t selling, I had to figure out what to do next.
Then I started using ChatGPT as my selling partner.
Now I have a second opinion whenever I need one—to evaluate prices, consider offers, understand listing activity, and decide what to do next.
WHEN YOU’RE NOT SURE WHAT TO DO NEXT
Every Seller Has Questions. Now You Have Someone to Ask.
You've probably faced some of these situations yourself.
With ChatGPT as your selling partner, you can talk through the problem, explore your options, and decide what to do next.
💬 My listing has lots of views, but nobody's buying. What's going on?
💬 Is my price too high, or should I wait?
💬 Someone offered me $200. Should I accept or counter?
💬 Would I be better off selling these items separately?
💬 A buyer has stopped responding. What should I do?
💬 Does this payment request sound suspicious?
You don't need to know all the answers. You need to know how to work through the questions.
YOUR SELLING PARTNER PLAYBOOK
See What’s Inside the Playbook
The Playbook is organized into 10 practical plays — simple situations you’ll face as a seller, from deciding what to sell to closing the deal safely.
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Get ChatGPT working with you — give it context so it understands what you’re selling and what you want to achieve.
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Know what you have and what it’s worth — identify items, assess condition, research prices, and choose your asking price.
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Create better listings, faster — choose photos and prepare headlines and descriptions.
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Make smarter selling decisions — evaluate offers, understand listing activity, and decide whether to change your strategy.
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Handle buyers with confidence — respond to questions, negotiate, recognize scams, and close safely.
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Learn from real examples — see how I used ChatGPT through actual Marketplace sales.
The 15-Minute Marketplace Playbook · $19.99 USD
TESTED ON REAL MARKETPLACE SALES
Real Items. Real Decisions. Real Results.
These are actual items I sold from around my own house using the same process as the playbook.
$25,000+ sold • 40 + Marketplace listings • real household items • real buyers
C$750
Sold in 1 day
Helped identify, price, and handle buyer questions
C$400
Sold in < 24 hours
Helped research value and position a specialty item.
Olympic $20 Coins
C$160
Sold in 5 days
Helped research value and find the right buyer.
Ping i530 Irons
C$550
Sold in 7 days (relisted)
Helped rethink the selling strategy when buyers weren’t responding.
C$750
Sold in 1 day
Helped identify, price, and handle buyer questions
C$400
Sold in < 24 hours
Helped research value and position a specialty item.
Olympic $20 Coins
C$160
Sold in 5 days
Helped research value and find the right buyer.
Ping i530 Irons
C$550
Sold in 7 days (relisted)
Helped rethink the selling strategy when buyers weren’t responding.
Why I Built Know It. Sell It.
Like a lot of people, I had things around the house I wasn’t using anymore—golf clubs, a barbecue, collectibles, and other belongings.
I started selling them on Facebook Marketplace. I learned how to research prices, take better photos, write listings, and deal with buyers.
It worked. But I was making every selling decision on my own.
Then I started using ChatGPT differently.
Instead of just asking it questions or having it write an ad, I began treating it as my selling partner. I’d show it photos, discuss pricing, ask about offers, and return whenever a listing wasn’t getting results.
That’s when I realized how useful a selling partner could be.
I’ve now sold more than $25,000 worth of things I already owned, and I’ve learned that ChatGPT’s real value isn’t simply saving time writing listings. It’s having a second opinion whenever I need one.
That’s why I created Know It. Sell It.—to show everyday Marketplace sellers how to use ChatGPT as a selling partner, make better-informed decisions, and sell with greater confidence.
— Jeff Goldstein, Founder
Ready to Meet Your Selling Partner?
Learn the system I use to sell smarter, make better decisions, and take the guesswork out of Marketplace selling.
The 15-Minute Marketplace Playbook · $19.99 USD
Frequently Asked Questions
The Playbook is designed for people who have some experience selling on Facebook Marketplace and want a smarter, less frustrating way to do it.
If you’ve sold a few things, dealt with buyer questions or offers, or wondered why an item isn’t selling, you’ll recognize the situations covered.
You don’t need to be an AI expert. Just be comfortable using everyday technology and willing to learn how ChatGPT can become your selling partner.
A little familiarity with ChatGPT is helpful, but you don’t need advanced skills.
The Playbook shows you how to give ChatGPT the right information, ask useful follow-up questions, and keep the conversation going as your sale progresses.
It works with the free version of ChatGPT, subject to its usage limits.
Facebook Marketplace is the primary focus, and that’s where I’ve developed and tested the system.
Many of the same principles—identification, researching prices, choosing photos, negotiating, and handling buyers—can also be applied to platforms such as Kijiji and eBay.
However, the actual listing steps, fees, and selling rules differ by platform.
You can start using ChatGPT as your selling partner with your next item.
With practice, the system can help you go from photographs to a ready-to-post Marketplace listing in about 15 minutes. Beginners may take longer.
But the real benefit continues after the listing is posted—when you’re evaluating offers, responding to buyers, or deciding what to do next.
You get The 15-Minute Marketplace Playbook, a 47-page downloadable PDF showing you how to use ChatGPT as your selling partner.
The guide includes 10 practical plays, each with a complete, ready-to-use ChatGPT prompt. You’ll also find Helpful Tips, practical selling advice, and real Facebook Marketplace listings showing the original asking prices, actual selling prices, and how long the items took to sell.
It works with the free version of ChatGPT, and you can return to the Playbook whenever you have another item to sell.
No. ChatGPT is your selling partner, not your replacement.
It can help identify possibilities, research market evidence, compare options, and suggest next steps. But it can also make mistakes, particularly when identifying items or estimating prices.
You remain in control, verify important information, and make the final decisions.
Questions? We’re here to help.
Not sure if the Playbook is right for you?
Have a question before you buy? We’re happy to help.
Know It. Sell It. provides educational selling guidance and research-based resale information. AI-generated advice and market estimates may be inaccurate and should be independently verified. Our materials are not professional appraisals or authentications, and we do not guarantee any particular selling price or time to sell.