Verses with the word buyer in the Old Testament (3 verses):
Proverbs 20:14
It is naught, it is naught, saith the buyer: but when he is gone his way, then he boasteth.
Isaiah 24:2
And it shall be, as with the people, so with the priest; as with the servant, so with his master; as with the maid, so with her mistress; as with the buyer, so with the seller; as with the lender, so with the borrower; as with the taker of usury, so with the giver of usury to him.
Ezekiel 7:12
The time is come, the day draweth near: let not the buyer rejoice, nor the seller mourn: for wrath is upon all the multitude thereof.
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