It pays to evaluate the fine details.
I had stumbled upon a very tempting Pokémon Trading Card Game Full Art Trainer lot of sixteen cards for only $16, plus $1.32 in shipping and handling. This lot has an estimated market value of $38. Most of the cards are bulk except for the following cards (along with its current market value):
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2023 Scarlet & Violet Paradox Rift Special Illustration Rare 257/182 Professor Turo's Scenario - $6.
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2026 Mega Evolution Ascended Heroes Ultra Rare Full Art 256/217 Boss's Orders - $13.
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2026 Mega Evolution Ascended Heroes Ultra Rare Full Art Ultra Rare 262/217 N's PP Up (x2) - $5.
The problem with this lot is it's guaranteed to ship in a plain white envelope with 1 oz of rigid postage. Even if this seller knows how to ship 16 cards via this method, all of these cards and the envelope combined is well over 1 oz. There’s a high chance it will be returned to the sender or arrive requiring additional postage.
If this seller doesn't know how to ship 16 cards via this method, it gets even worse. The buyer will most likely need to pay the Retail cost of Ground Advantage, which starts at $7.30 as of this writing. Since the USPS would acknowledge the $1.32 the seller already paid, the buyer would need to pay at least $5.98 to accept this envelope.
Some or all of the cards would also be damaged in the process because it's very challenging to protect sixteen cards in a plain white envelope. These cards may ultimately be worth less than the $17.32 the buyer paid.