godan verb (-su)
begin purchasing; start buying
Focuses on the initiation of buying, often in a commercial or stocking context.
来月から新しい仕入れ先から買い出す予定です。
We plan to start purchasing from a new supplier next month.
godan verb (-su)
General purchasing, often for supplies or stock; slightly more formal than 買う.
週末にまとめて食材を買い出す。
I buy groceries in bulk on the weekend.