Hey kaotkbliss, if you can't find anyone to sell these to you, the magnet sizes I use for my minis are typically sized 2x1mm and 1x1mm (which I believe are 5/64"x3/64" and 3/64"x3/64" respectively). I've heard some good things about these folks in the U.S. (but have not used them myself):
https://www.kjmagnetics.com/ (of course you can do a search for "rare earth magnets" and bring up dealers closer to you, etc.). For what it's worth, you would prefer rare earth magnets as they are incredibly strong for their size.
Good luck.