Magnetic base for JAWONG Catan tiles

I designed this base when I saw JAWONG's Catan tiles several months ago. This base holds 6 small, cylindrical, diametrically polarized magnets. The magnets are free to rotate about their axes. With the base glued to the bottom of the tiles, the tiles are self assembling and hold together.

I made a few for testing using these magnets (cyl0065D http://www.supermagnetman.net/index.php?cPath=30) and they worked fantastically. However, the magnets were too expensive for an entire set and I end