Recommendations for Low Beginners
Very Easy True Stories: A Picture-Based First Reader by Sandra Heyer -
http://www.amazon.com/Very-Easy-True-Stories-Picture-Based/dp/0201343134/ref=pd_cp_b_0
This series sounds promising, because it provides students with captioned pictures that clarify the meaning of the sentences beneath the pictures. Next, students read the story in text form for real reading practice. Finally, students complete exercises following each story to develop basic reading skills as well as build pronunciation, spelling, and vocabulary proficiency, but I am told the exercises are not higher level.
All New Very Easy True Stories –
http://www.amazon.com/Very-Easy-True-Stories-Picture-Based/dp/0131345567/ref=cm_cr_pr_sims_t