The books are primarily sold by Amazon. However, they are also available in multiple stores in the USA and the rest of the world. Feel free to search for the books in your favorite bookstore!
Yes! They are sold in Kindle format through Amazon. This format can be read with the Free Kindle App.
100% Yes! I do discounts and even do giveaways! You can find about any promotions announced in my Instagram account @jlptkanjimnemonics