I use my Windows smart phone that way I don't have an extra gadget to carry around (& probably lose!) & it fits in my pocket--I don't carry a purse. I prefer the Barnes & Noble software & purchasing system over the Kindle/Amazon version and I have other readers for other types of books. If it's an e-book--I can read it with something loaded on my phone.
I agree about the prices being way too high on the best seller type e-books and many of the not quite best sellers. I don't understand the need to charge so much for something you can't even donate when you're finished with it. I refuse to pay more than $5 per e-book.