This looks like a great site for older students to use to read to their younger siblings. A Story Before Bed allows you to record reading a story. You need a microphone and a webcam to complete the recording. They have some free books however most have a fee. It does appear they have a special for teachers in grades K-5 for a trial 2 month subscription and 50 free books. I've signed up even though I teach grade 6. If you want to learn more about this program, click on the title of the posting.