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Add standard items, back issues and custom items to a collection.
Each line you added to the collection has the option to assign an amount you'll pay your seller for it. This amount is assumed to be your trade offer. In the right hand sidebar, you'll see a suggested offer for credit and for cash. You can change your cash multiplier to offer a percentage of the credit offer. We usually give this a 50% or 60% amount in our store, but you can use whatever you want.
The suggested values are just that. A suggestion. You can use the field above the suggested number to assign an actual offer.
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Lock a collection once it's been paid for or your offer has been refused