A-Tech 4GB Module for Lenovo ThinkPad T450 Laptop & Notebook Compatible DDR3/DDR3L PC3-14900 1866Mhz Memory Ram (ATMS350688B13039X1) at Amazon.com
Lenovo ThinkPad T450 14in HD Business Laptop Computer, Intel Dual-Core i5-5300U Up to 2.9GHz, 8GB RAM, 256GB SSD, HDMI, 802.11ac WiFi, Bluetooth, Windows 10 Professional (Reused) - Walmart.com
Lenovo ThinkPad T450 20BV0005US 14 Notebook 1366 x 768 Core i5 i5 5200U 4 GB RAM 500 GB HDD Black Windows 7 Professional 64 bit Intel HD Graphics 5500 Bluetooth 10.08 Hour Battery Run Time - Office Depot