iMac 27" Late 2015 A1419 4K - SLOW Fusion hard drive replacement with new internal SSD, MUCH FASTER! - YouTube
Timetec 1TB(1000GB) MAC SSD NVMe PCIe Gen3x4 3D NAND TLC Read Up to 2,200MB/s Compatible with Apple MacBook Air(2013-2015, 2017), MacBook Pro (2013-2015), iMac(2013-2019), Mac Pro(2013), Mac Mini(2014) at Amazon.com
Amazon.com: PCIe NVMe Gen3x4 SSD 1TB 512GB 256GB 128GB 3D TLC NAND Flash Hard Drive SSD Replacement for MacBook Air 2013-2017, MacBook Pro Retina 2013-2015, iMac 2013-2017, Mac Pro 2013, Mac Mini 2014 (1TB) : Electronics
Amazon.com: INDMEM 512GB NVMe PCIe SSD 3D TLC NAND Flash Hard Drive Disk 512G Only for Late 2013 - Mid 2015 MacBook Pro, Mid 2013-2017 MacBook Air, Late 2013-2017 iMac, Late 2013
Apple 2TB PCIe SSD Flash Storage - 2013-2015 Retina MacBook Pro A1398 A1502 | eBay
Apple iMac review (21.5-inch, 2015): 4K is optional, faster hard drives shouldn't be | Engadget
MacBook Air 13" Early 2015 SSD Replacement - iFixit Repair Guide