Amazon has several Step Into Reading books marked down for under $2 each. You can do the slow shipping to get a $1 digital credit on each of these, making them less than $1 in the end:
T-Rex Trouble! (DC Super Friends) (Step into Reading)
https://smile.amazon.com/gp/product/0375867775 ($1.18)
Sing Your Song! (Nella the Princess Knight) (Step into Reading)
https://smile.amazon.co
Mulan Is Loyal/Merida Is Brave (Disney Princess) (Step into Reading) [2 books in 1!]
https://smile.amazon.co
Driven to Win! (Disney/Pixar Cars 3) (Step into Reading)
https://smile.amazon.com/gp/product/0736436820/? ($1.48)
https://smile.amazon.co
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