I've seen his type of shoes before, but...I think the ones he wears are custom made.
You'd probably have to get it custom made to be exactly like his shoes (the height and all)...
I've checked for some stores, but couldn't find any that match his shoe exact.
Sorry I am not much help, there are some platform on ebay (of all places) that are very similar to what you want, but many lolita sight I had to check and couldn't find that match exact.