Look for hand bells – or hand bell manufacturers. Depending on the quality and number you want a cheap set of children’s bells will be about £40 from Ebay. On up the sky’s the limit.
https://www.bellsofwhitechapel.london/clock-bells/ will make tuned sets of clock bells to order according to their website.
Cousins the clock parts suppliers do bells in various sizes, but I don’t know about the tuning. Real bell tuning is an art, but you may need a big machine depending on the size of the bell.
You could also peruse Ebay or your local auction house for an old musical clock and scavenge the bells off that.