Tell him you're aware of that, but since you have people willing to offer you better trades, you'll be holding onto your supplies until he sweetens the deal or you find someone else willing to offer you a better trade. Dr. Wilson's trade is proof that Solomons is trying to squeeze you for more than the stuffed animals are worth.
Also tell him good luck on finding anyone else to trade his stuffed animals with. You're the only buyer for those things here. That means you control the price, not him.
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Tell him you're aware of that, but since you have people willing to offer you better trades, you'll be holding onto your supplies until he sweetens the deal or you find someone else willing to offer you a better trade. Dr. Wilson's trade is proof that Solomons is trying to squeeze you for more than the stuffed animals are worth.
Also tell him good luck on finding anyone else to trade his stuffed animals with. You're the only buyer for those things here. That means you control the price, not him.