I’ve had good luck with Rapid Rooters from General Hydroponics. They are used to start seeds or cuttings. If they dry out before use, you can re-wet them. They work well as long as they are kept moist, but not soggy. Rapid Rooters are single use. Made by General Hydroponics
Be careful, as the tip gets very hot, but a cheap soldering iron can make quick neat holes in plastic drinking cups or pails.