This old drug was free. Now it’s $109,500 a year. -- The Washington Post

The zigzagging trajectory of the price of Daranide, now known as Keveyis, shows just how much freedom drug companies have in pricing therapies — and what a big business opportunity selling rare-disease drugs has become.
https://www.washingtonpost.com/news/wonk/wp/2017/12/18/this-old-drug-was-free-now-its-109500-a-year/