The ruling on a merchant increasing the price of a commodity he brought at the buyer's request

Question:
Abu 'Abdullah says: Shaykh, I asked the owner of a large store, Hafiz, who sells goods, for an item. He did not have that item in stock, so he went to a neighboring store and brought it back immediately, but he increased the price at which it is sold without informing me. Is that permissible for him?

Answer:
If you did not conclude the sale before he brought it, did you conclude a sale on it? No, he merely promised you this, then went and brought it. Then you traded after the commodity arrived and you saw it. The sale is valid. The sale is valid. As for his increasing the price, he is required to inform you. He is required to inform you that he bought it for such-and-such and that he wants to add to that. If you are satisfied with this, there is no harm. Yes.