Refurbished: Dell Latitude 5590 15.6" Laptop, Intel i5 8250U 1.6Ghz, 16GB DDR4, 1TB NVMe SSD, HDMI, USB Type C, Webcam, Windows 10 Pro (Grade B) - Newegg.com
Latitude 5590 Teardown removal guide for customer replaceable units (CRUs) | Dell US
Computer Memory Solutions DKVWTVP 128GB SSDNow M.2 SATA 6Gb Compatible with Dell Latitude 15 (5580), Latitude 15 (5590), Latitude 15 (E5570) by CMS C67
How to add Second Hard Drive to Dell Latitude 5580 or 5590 | The Wichita Computer Guy