[zaroth]

There's a great article about prison radios and MP3 players, and a particular model of Sony FM receiver that is like 30 years old but incredibly popular in prisons due to battery life or something... Gotta track that down.

[ceejayoz]

http://www.newyorker.com/tech/elements/the-ipod-of-prison

[andyjohnson0]

This was discussed earlier this year on HN.

https://news.ycombinator.com/item?id=7073242