HPE 8GB DDR4 SDRAM Memory Module - for Server - 8 GB (1 x 8GB) - DDR4-3200/PC4-25600 DDR4 SDRAM - 3200 MHz Single-Rank Memory - CL22-1.20 V - Unbuffered - 288-pin - DIMM at Amazon.com
SAMSUNG M471A1K43CB1-CRC 8GB DDR4 2400MH Memory Module (8 GB, 1 x 8 GB, DDR4, 2400 MHz, 260-Pin SO-DIMM) at Amazon.com
OWC 8 GB (2 X 4GB) ram PC8500 DDR3 1066MHz sodimm 204-pin Memory Upgrade Kit, (OWC8566DDR3S8GP), Compatible with MacBook Pro, MacBook, Mac Mini and iMac at Amazon.com