The author has published two ebooks about canker sores on Amazon's Kindle marketplace after previously only selling them on their website. The first ebook, which provides an overview of canker sores as an immune system disorder, is available for 99 cents. The second ebook, containing treatment information, is priced at $6.99 but can be read for free by Amazon Prime members or borrowed for a limited time. Visitors to the author's website can find more details.