A-Tech 2GB Memory RAM for Dell Latitude E6420 - DDR3L 1600MHz PC3-12800 Non ECC SO-DIMM 1Rx16 1.35V - Single Laptop & Notebook Upgrade Module ( Replacement for SNPTX3GVC/2G) at Amazon.com
A-Tech 16GB Kit (2x8GB) RAM for Dell Latitude E6520, E6510, E6420, E6320, E6220, E5520, E5420 Laptop | DDR3 1333 MHz SODIMM PC3-10600 Memory Upgrade at Amazon.com
OFFTEK 4GB Replacement Memory RAM Upgrade for Dell Latitude E6420 (DDR3-10600) Laptop Memory at Amazon.com