I was so excited to discover that the Reading for All Learners books (the books we use for our “Book Buddies”) could be purchased as an iPad app! This could be a great alternative for you if you want the capability of doing reading homework on an iPad! The prices are reasonable, too: each book set is $9.99, or the entire collection, including all book sets, is $49.99. If you are looking to have these books available on iPad for your first-grader or for a younger sibling, this is a great option. 
Click on this link:
https://itunes.apple.com/us/app/reading-for-all-learners-i/id576498956?mt=8