Synology RAM DDR3L-1866 SO-DIMM 4GB (D3NS1866L-4G) at Amazon.com
DDR3L 4GB 1600Mhz PC3-12800 Low Voltage SODimm RAM Memory
Crucial 16GB 8GB 4GB RAM PC3L-12800 DDR3L 1600MHz SODIMM Laptop Memory LOT AB – ASA College: Florida
Hynix 4 GB DDR3L Laptop Ram 1600 MHz/ 12800U MHz SODIMM with 3 Year Warranty - Royal Computer Solution
Crucial 4GB DDR3 SDRAM Memory Module - Newegg.com
HP RAM Memory 1 x 4GB DDR3L SDRAM 4 DDR3 1600 DDR3L SDRAM H6Y75AA#ABA at Amazon.com
A-Tech 4GB RAM Replacement for Samsung M471B5173QH0-YK0 | DDR3/DDR3L 1600MHz PC3L-12800 1Rx8 1.35V SODIMM 204-Pin Memory Module at Amazon.com
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com