Kingston ValueRAM 32GB (1 x 32GB) DDR4 2400 RAM (Server Memory) ECC Reg Micron A DIMM (288-Pin) KVR24R17D4/32MA Server Memory - Newegg.com
32 GB Unbuffered DIMMs Listed from Ten Brands: DDR4-2400 to DDR4-4000
Apple Memory Module 32GB DDR4 2400MHz SO-DIMM (2x16GB) - Apple
G.SKILL F4-3600C16Q-32GTZR 32 GB (8 GB x 4) Trident Z RGB Series DDR4 3600 MHz Dual Channel Memory Kit - Black with Full Length RGB LED Light bar at Amazon.com
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com