I love finding containers for my fairy gardens! Most of the ones I use come from thrift shops or yard sales. Almost anything that holds soil will work. I saw one online that was made in an old guitar case.
I made this one in a mini red wagon for my daughter's birthday last year.
My gnome garden is made in a small galvanized tub. There's mischief going on in this garden. The gnomes are drinking ale and partying when they should be working. The little cedar tree came out of one of my flower beds. Notice the owl sitting in the top.
My full size wagon garden had to be moved to the top of a trunk when my puppy, Perl, arrived this spring.