This is an issue that I occasionally find when listing used books. If I have any information, I enter it. If not, I may make an educated guesstimation or use the amount of $0. In all my years of selling on Amazon, I have never had a problem.
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I have put it a bit more than my selling price like a pound difference.
Entering 0 is Amazon’s official recommended action if there is no RRP or if you don’t want to enter one.
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