Thanko recently unveiled the TL (Timeline) Portrait Display. At ¥11,200 (about $100), it’s a 7.9” 70 x 208mm screen that connects to a PC or laptop through HDMI and gets power through micro USB.
https://www.techspot.com/news/93275-there-another-super-thin-secondary-pc-monitor-out.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/93275-there-another-super-thin-secondary-pc-monitor-out.html?utm_source=dlvr.it&utm_medium=blogger