Zulily has some cute Disney Birkinstocks today. I hate buying shoes online especially when I can't return them but these were just too cute. I took a risk and got some.
Most Birkis run true to size, so if you know your size in them you should be good. Sadly, they were all out in my size. I did manage to find a couple of other pair for $29.99 which is a good price.