* [Musicnotes](https://www.musicnotes.com/sheet-music/mtd.asp?ppn=MN0141198): Musicnotes is an online music store that sells sheet music for a wide variety of instruments. They have a version of "The Duel" for cello solo.
* [Sheet Music Plus](https://www.sheetmusicplus.com/title/the-duel-cello-music/21122454?aff_id=151582): Sheet Music Plus is another online music store that sells sheet music. They have a version of "The Duel" for cello and piano.
* [Amazon](https://www.amazon.com/The-Duel-Cello-Giorgio-Moroder/dp/B075V2G5K3/ref=sr_1_1?crid=15G02M0Q5P788&keywords=giorgio+moroder+the+duel+cello&qid=1673208860&sprefix=giorgio+moroder+the+duel+c%2Caps%2C367&sr=8-1): Amazon is an online retailer that sells a wide variety of products, including sheet music. They have a version of "The Duel" for cello and piano.
You may also be able to find cello sheet music for "The Duel" at your local music store.