16GB Memory for Apple iMac Retina 5K, 27-inch (2017) DDR4 2666 MHz SODIMM RAM | eBay
16GB DDR4 2400 MHz PC4-19200 Mac Memory RAM for APPLE iMac Mid 2017 A1418 A1419 | eBay
Crucial DDR4 kit 16 GB 2 x 8 GB SO DIMM 260 pin 2400 MHz PC4 19200 CL17 1.2 V unbuffered non ECC for Apple iMac with Retina 5K display Mid 2017 - Office Depot
32GB (2X 16GB) DDR4 2400MHz PC4-19200 SO-DIMM RAM Memory Upgrade for 2017 iMac 27 inch with 5K Retina Display (PARTS-QUICK) - Walmart.com
Timetec 16GB Compatible for Apple 2017 iMac (27-inch w/Retina 5K, 21.5-inch w/Retina 4K / Non-Retina 4K) DDR4 2400MHz PC4-19200 CL17 SODIMM Memory MAC RAM Upgrade for iMac 18,1 / iMac 18,2 /
A-Tech 32GB (2x16GB) RAM for Apple iMac 2017 (27 inch Retina 5K & 21.5 inch Retina 4K) | DDR4 2400MHz SODIMM PC4-19200 2Rx8 1.2V 260-Pin SO-DIMM Memory Upgrade Kit at Amazon.com
DDR4 | 2017 iMac | 32GB | SO-DIMM | iMac Memory
OWC 32GB (4x8GB) 2400MHZ 260pin DDR4 SO-DIMM PC4-19200 MemoryRam Module Upgrade Compatible with 2017 iMac 27 inch with Retina 5K Display (OWC2400DDR4S32S) at Amazon.com
Refurbished: Apple A Grade Desktop Computer iMac 21.5-inch (Retina 4K) 3.4 GHz Core i5 (I5-7500) 8GB RAM 256GB SSD Mid 2017 MNE02LL/A-BTO 4096 x 2304 Display Mac OS - Newegg.com
How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
Crucial DDR4 kit 16 GB 2 x 8 GB SO DIMM 260 pin 2400 MHz PC4 19200 CL17 1.2 V unbuffered non ECC for Apple iMac with Retina 5K display Mid 2017 - Office Depot
Genuine Apple 8GB 2 x 4GB PC4-2400 (19200) 260-pin 2400MHz DDR4 iMAC 2017-19 | eBay
DDR4 | 2017 iMac | 32GB | SO-DIMM | iMac Memory
Timetec 64GB KIT (4x16GB) Compatible for Apple 2017 iMac (27-inch w/Retina 5K Display) DDR4 2400MHz PC4-19200 1Rx8 CL17 1.2V Non-ECC Non-Parity Unbuffered SODIMM Memory MAC RAM Upgrade for iMac 18,3 at Amazon.com
Apple A Grade Desktop Computer 27-inch iMac A1419 2017 MNEA2LL/A 3.5 GHz Core i5 (I5-7600) 32GB RAM 2 TB SSD Storage Mac OS Include Keyboard and Mouse - Walmart.com
Apple iMac (27-inch, 2017) review: Apple doesn't mess with success - CNET