Amazon, 300pcs $9.99 free shipping..3x2 mm...this is what i use.. https://www.amazon.com/Deryun-300pcs-Magnet-Magnets-Projects/dp/B081JVR49B/ref=sr_1_3?crid=23AFJUZNOWTL1&keywords=Deryun+magnet+300pcs+mini+Magnets+Small+Magnet+Tiny+Magnets+Miniature+Magnets+Little+Magnet+Small+Round+Magnets%2C+Tiny+Magnets+for+Crafts%2Cmagnit%2Cmini+M&qid=1707093946&sprefix=deryun+magnet+300pcs+mini+magnets+small+magnet+tiny+magnets+miniature+magnets+little+magnet+small+round+magnets%2C+tiny+magnets+for+crafts%2Cmagnit%2Cmini+m+%2Caps%2C258&sr=8-3