I wasn't even looking for them when I found them! You can also look at shopgoodwill.com, which includes listings from a whole bunch of Goodwills. I might make sure they're tested, though? In the store I could test it on my own, but you can't really do that online.:/

I bought several Paperwhites for my family for, like, $10 apiece at goodwill and they are so great! So easy on the eyes, you can adjust the font size to your liking. It's hard for me to go back to paper, to be honest?