Small Strong Neodymium Magnets | Little Circle Magnets
Wukong Extra Strong Magnets Pack 8mm X 3mm, Grade N45 Magnetic Circular Disk for Fridge, Pin Board, White Board or Picture magnet-108 Pack : Amazon.co.uk: Home & Kitchen
Neodymium Disc Magnets 5mm Dia x 3mm Thick Grade N50 Small & Strong Round Magnet | eBay
N35 Super Strong Powerful Small Micro Round Rare Earth Neodymium Electro Magnets - China Disc Magnets, Permanent Magnet | Made-in-China.com