You could for a while get a Fire Phone for something like $100, which included a year Prime subscription. That meant that you were paying around $20 for a phone

You could for a while get a Fire Phone for something like $100, which included a year Prime subscription. That meant that you were paying around $20 for a phone and what were actually some pretty good pack-in wired earbuds at a time when wireless earbuds weren't a thing. I did this, and the phone was serviceable once you rooted it, so long as you remembered the price you paid for it.