Don't waste money buying them at a store. Make your own. I did last year (red ones for a Dorothy costume) and they held up well.
Get an old pair of shoes or a pair from a thrift store (I used patent leather), brush regular white glue over all surfaces of the shoe except the sole. (Spray adhesive will also work though a bit more expensive.) While glue is still wet, dump glitter to cover shoe. Shake off excess and let dry.
When the shoe has thoroughly dried, use a small brush to sweep glitter off sole of shoe. Spray shoe with spray polyurethene or hi-gloss finish for decoupage projects (I used ClearCote). Two coats of spray finish are desirable. You can customize the color of the "glitter shoe" to match your child's costume.
By Nancy in FL