Harper Hobby Cards
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HARPER HOBBY CARDS
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ROI Thresholds (fixed)
HIGH RETURN ≥ 2× · LOW RETURN < 2×
Shipping Cost
All-in shipping (buy → PSA → return)
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PSA Fee
Hard-coded at $30 per card. A $15 cleaning fee is added automatically when the PSA 9 value exceeds $300.
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