PNY 8GB 2.666GHz PC4-21300 DDR4 SO-DIMM Unbuffered Non-ECC Laptop Memory Black MN8GSD42666 - Best Buy
SAMSUNG 8GB DDR3 SO-DIMM Memory Module at Amazon.com
Crucial RAM 8GB DDR4 3200MHz CL22 (or 2933MHz or 2666MHz) Laptop Memory CT8G4SFRA32A at Amazon.com
A-Tech 8GB Memory RAM for Dell Latitude 3410 - DDR4 3200MHz PC4-25600 Non ECC SO-DIMM 1Rx8 1.2V - Single Laptop & Notebook Upgrade Module (Replacement for SNP6VDX7C/8G) at Amazon.com