I ordered them from the shop Disney parks app. I wear Crocs all the time and the first time I wore these they rubbed a nice hole in my small toe. I'll spare you the details but I was walking from Epcot to the Swan at the time
If you get them, make sure you break them in a lot longer than you think you need to.
I'd install the Shop Disney Parks app on your phone if you have an iOS device. Shows you exactly where you can find them. It only shows the adult in blue, but I just picked a random size and it showed them at every park, a handful of resorts, and Disney Springs. Looks like the main store at each park should carry them, IE Emporium, Mouse Gear, etc.