noun
Refers to a business or person from whom goods or materials are purchased; common in commercial and procurement contexts.
新しい仕入れ先を探しています。
We are looking for a new supplier.
この部品の仕入れ先はどこですか。
Who is the supplier for this part?
Compound of 仕入れ (purchasing, stocking) from verb 仕入れる, and 先 (destination, source). Literally 'purchasing source'.