This cute little plastic Mini Melissa aqua flocked Ultragirl ballet flat is on sale at nearly a 70% discount right now on Amazon.   Normally $55, it has been marked down to $16.50 and qualifies for free Prime shipping.  I would probably not be willing to give this a try at $55, but at $16.50... sure!  Unfortunately, these are only available in kids sizes 1, 2 and 3.  I am crossing my fingers that those are just the sizes you need...