Reading elephant has a shop full of systematic phonics books. The schwa is the most common sound in the english language.

Consonant Charts Free Pronunciation E Course The Mimic Method
The wonders reading program includes various materials that enable teachers to differentiate instruction. Reading wonders curriculum in my classroom with freebies my school has recently adopted the mcgraw hill reading wonders program.

Mcgraw Hill Reading Wonders Unit High Frequency Word Tests 1st Grade