8GB [2x4GB] DDR3-1333 RAM Memory Upgrade Kit for The Dell Latitude E6420 (Genuine A-Tech Brand) at Amazon.com
Amazon.com: Crucial 4GB Upgrade for a Dell Latitude E6420 System (DDR3 PC3-12800, Non-ECC,) : Electronics
Dell Latitude E6420 RAM Memory Removal and Installation
8GB 2X4GB Memory RAM for Dell Latitude E6420 ATG DDR3 SO-DIMM 204pin PC3-8500 1066MHz Black Diamond Memory Module Upgrade - Walmart.com
8GB Kit 2 x 4GB Memory RAM for DELL LATITUDE E6420 XFR E6430 E6430s E6520 E6530 | eBay
Restored Dell 14" Latitude E6420 Laptop PC with Intel Core i5-2520M Processor, 8GB Memory, 120GB Solid State Drive and Windows 10 Pro (Refurbished) - Walmart.com