Unsold Merchandise, Remaining Stock
noun
The remainder products are the things that haven't been sold. They're the unsold merchandise. They're the remaining stock. This is a very specific word that is mainly used in the context of inventory management or retail sales.
ざんぴん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Note that ひん changes to ぴん.
残品はこちらで引き取るので、こちらのお店で販売させてもらえませんか。
You can return any unsold stock, so would you let us sell our products here?
今夜店を出発する前に残品を数えておきましょう。
Before we leave the store tonight, let’s go ahead and count the remaining stock.
残品は半額で処分しました。
We sold the remaining goods at half price.