Apple iMac 27 Inch 5K 3.0 GHz Core i5 1TB Fusion 16GB 2667MHz RAM 4GB GFX 2019 | MacPro-LA
Best Buy: Apple 27" iMac® with Retina 5K display Intel Core i5 (3.3GHz) 8GB Memory 512GB SSD Silver MXWU2LL/A
maxupgrades.com: Single SSD Drives kit for iMac 27 inch 2012 Models with SATA Blade SSD Module / Heatsink/ Power Cable and DATA Cables for [SSD + HDD] with iMac Adhesive LCD Tape
Amazon.com: Apple iMac 21.5 inches Retina 4K i5-8500 8 256GB SSD Radeon Pro 560X Silver MHK33LL (Renewed) : Electronics
Upgrading a 27-inch iMac 5K to 14 terabytes - Replacing the Fusion Drive with both a SSD and an harddisk