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Seller Knowledge Base
A simple, organized resource to help you sell with confidence and maximize your earnings.
Seller Knowledge Base
Welcome! Browse the articles below to find answers to your questions throughout the selling process.
Getting Started
Inventory
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Entering Inventory
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Pricing Your Items
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Categories & Sizing
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Photos
Before Shopping
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Preparing for Shopping Week
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Following Your Sales
Sold Item Preparation
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Printing Sold Item Tags
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Scan at Home
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Scheduling Drop-Off
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Buyer Review Items
After the Sale
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Final Seller Report
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Seller Payments
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Preparing for the Next Sale
Need More Help?
If you can't find the answer you are looking for, we are happy to help.
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Visit the Seller Portal
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Join the GCOS Seller Facebook Group
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Join the Instagram Seller Group
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Contact the GCOS Admin Team
Last Updated: July 2026
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