Yes, there are things like Kindle Direct Publishing or Apple’s iBook creator, but School Library Journal’s Digital Shift has a great list of websites that can be used to create eBook .mobi and .epub files. We have students that create portfolios online. Imagine a collection of poems or essays in one contained file to load on an ereader.
The caution: What’s to stop an older sibling from giving the ebook to a younger system? You would need a system of checks to avoid plagiarism.