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Banggood is having an 8% off sale on many rare earth magnets. Beats my last popular deal I posted for 10x N50 magnets @ $ 1. You can get this set [banggood.com] of five N52 magnets for <$ 1 and they are much larger @ 10mm diameter x 2mm thick. The N rating indicates strength, btw.
Use code 8magne for an additional 8% off.