Here are a set of very good books for your little ones. These story books of Reading Level 4-7 years by Pegasus will be a very interesting read to your kids. Each book has collection of amazing stories focusing on the sounds of the alphabets. The letters are big and colorful with attractive pictures which will help your child to learn the sounds of the alphabets to the kids in phonics style.
The books are affordable and available at discounted rates at Amazon. Your child will definitely enjoy it.
Links to the 15 books in this set is given below.