CMS Magnetics® Grade N52 Super Strong Neodymium Magnet Ring OD1.26" x ID 1/2" x 3/8" - Rare Earth Magnet Ring for Classroom, Science Project and DIY Applications - One Pack: Amazon.com: Industrial
Green Stuff World - Neodymium Magnets 2x1mm - 100 units (N52)
N42 Neodymium Block Magnet 2x1x1/2 for Wind Turbines