単品

たんぴん【単品】

a single item [type of item] (to be sold); a single item out of a set.

●(食堂で) 料理を単品で注文する order individual dishes (rather than a set course)

・この品は単品ではお売りできません. These items cannot be sold singly.

単品売り[販売] the selling of single items [types of items, items out of a set].