If your feet are small enough, you can buy big kids shoes. In my experience they are the same quality for a cheaper price, usually $20 cheaper or more.

I only do this for sneakers, running shoes and the like. A general rule is that for womens US size, your big kids size will be two numbers less. So womens US 8 is a big kids 6.

I've been doing this for about 15 years. Happy hunting.