Yep. Not to gloat, but I never touched Amazon's ebook marketplace.

My current e-reader is a second-hand Kindle that has a permanent message asking if I would just please connect to a WiFi network just one time just for a moment PLEEEEEASE.

I get my books from libgen, Gutenberg, or Kobo, and keep them on my computer. They're organized in Calibre, and I transfer them over on a USB cable.