Ich hätte gerne ein Sonderangebot für Mengenrabatt

Pronunciation: Ich HET-uh GER-nuh ein ZON-der-ahn-guh-bot für MEN-gen-rah-bat

Meaning: I would like a special offer for a bulk discount

This phrase is useful when shopping for larger quantities and negotiating better prices—a common practice in German markets and stores where bulk purchasing is appreciated.