Silicon Power Hynix IC Compatible for Apple DDR3 DDR3L 16GB (2 x 8GB) RAM 1600MHz (PC3 12800) 204 pin CL11 1.35V Non ECC Unbuffered SODIMM Laptop Notebook Memory RAM Module Upgrade at Amazon.com
Samsung 1MB 30-Pin SIMM Fast Page RAM DRAM Memory Module 1MX8 80ns KMM581000B-8 | eBay
Apple Memory Module 16GB DDR4 2400MHz SO-DIMM (2x8GB) - Apple