Experience with Stirbars.com?
Stirbars.com has 2mmx7mm and 2x5mm magnets coated with PTFE (http://www.stirbars.com/list.php?sessionID=60ea195aa627320143e81adb440696f1&category=Stir Bars&subCat=Micro PTFE). 10 pack is $26.00. Does anyone have any experience with them? Or a better supplier in the US that will do small orders? I'm planning on injecting these with a microchip syringe.