G.Skill Ripjaws X Series 16 GB (2 x 8 GB) 240-Pin SDRAM (PC3-12800) DDR3 1600 CL10-10-10-30 1.50V Dual Channel Desktop Memory Model F3-12800CL10D-16GBXL at Amazon.com
G.SKILL Ripjaws X Series 8GB (2 x 4GB) DDR3 2400MHZ Desktop Memory Model F3-2400C11D-8GXM at Amazon.com
Amazon.com: OWC 64GB (4 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with 27" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S64S) : Everything Else
G.Skill 16GB DDR3 PC3-19200 2400MHz Sniper Series (11-13-13-31) Quad Channel kit (4x4GB) at Amazon.com
G. Skill 32GB DDR3-2400 at Amazon.com
Amazon.com: Corsair CMY16GX3M2A2400C11R Vengeance Pro 16GB (2x8GB) DDR3 2400MHz PC3 19200 Desktop RAM, Red 1.65V : Cell Phones & Accessories
Amazon.com: Corsair CMY16GX3M2A2400C11R Vengeance Pro 16GB (2x8GB) DDR3 2400MHz PC3 19200 Desktop RAM, Red 1.65V : Cell Phones & Accessories