Several people purchased storage cases from Michaels or Target. Some forum members posted images in other discussions.
I don't recall exactly where I got my plastic storage cases, but I think at least one was from Michael's. When I was at Menard's (a local/regional) hardware and home maintenance store last week, I noticed they also had some inexpensive plastic storage cases. I'm assuming they were probably meant for small nails or screws or something, but they would certainly work for the minis.
I do still keep some random ones in the cardboard "six pack" boxes that I got from the store. Also, I think I have a set or two in a large ziploc bag.
