I found mine in Michaels, they had lots of colors to start out with, but only square boards, it was weird because there were a few craft kits, that looked like they would have had round boards in them, like the image on the front of the box clearly was made using a round board o.o but when i peaked in the box, they all had square boards... it was so weird! I asked one of the employees and she didn't think they would be getting more stuff in for the minis.
I actually did check that site out before :/ I can't seem to find any of the mini sized things on there.