LG's G Flex is cool - the first flexible OLED device that actually flexes a bit. But it's not the world's first flexible device. Back in 2012, Russian company called Wexler released the Flex One flexible e-reader that was the first device (and only one?) to use LG's flexible plastic based E Ink panel (6", XGA 1024x768).
Anyway, the Flex One was later discontinued, but now I found it Amazon.com - for only $49.99. So here's your chance to own this little flexible e-reader and a little piece of display history. I played with this little device back in 2012 during SID 2012. It's quite shatterproof - and very light - and flexible and somewhat very plasticy: