Have you tried file folder games? They are a great way to independently reinforce skills. This Turkey Ten Frame Matching File Folder is great for Preschool, Kindergarten, and Special Education. They are perfect for a structured work station for students with Autism.
You can make three different file folders with this product. You can have students match upper case letters to lower case letters, lower case letters to lower case letters, or upper case letters to upper case letters.
Be sure to check out all of my File Folder Games