I use this one for my DnD games, but it fits the bill.
https://www.amazon.com/Transparent-Sapphire-Numbers-Koplow-Games/dp/B00MWVXBQ0/ref=sr\_1\_7?crid=P57IVMWM5AJ4&dchild=1&keywords=large+d20&qid=1635362719&sprefix=large+d20%2Caps%2C203&sr=8-7#customerReviews