Lenovo Thinkpad T420: Another excellent, inexpensive Linux laptop | Open-Source Routing and Network Simulation
Lenovo ThinkPad T420 14.0" Standard Used Laptop - Intel Core i5 2520M 2nd Gen 2.5 GHz 4GB SODIMM DDR3 SATA 2.5" 320GB HDD DVD-RW Windows 10 Home 64-Bit - Walmart.com
Amazon.com: Lenovo Thinkpad T420 - Intel Cre i5 2410M 2.3G 8GB 320GB Windows Professional - Bulk Packaging : Electronics
Used Grade A Lenovo ThinkPad T420 14.0" Laptop, Intel Core I7-2620M up to 3.4Ghz, 8G DDR3, 500G, DVDRW, DP, W10P64-Multi Languages Support (EN/ES/FR), 1 year warranty - Walmart.com