Lenovo ThinkPad T420S 14.0" Standard USED Laptop - Intel Core i5 2520M 2nd Gen 2.5 GHz 8GB SODIMM DDR3 SATA 2.5" 128GB SSD DVD-RW Windows 10 Pro 64-Bit - Walmart.com
Lenovo Thinkpad T420s review
Lenovo ThinkPad T420/T420i - iFixit
CMS 16GB (2X8GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad T420S 4170, 4171, 4173, 4174 - A13 at Amazon.com
Lenovo ThinkPad T420s, Windows 11 Pro, 16GB Ram, 512GB SSD, MS Office | eBay