Amazon.com: Odyson - 512GB SSD Upgrade Kit Replacement for Apple iMac 21.5" A1418 (Late 2013-Mid 2014) : Electronics
Buy Apple iMac A1418 21.5" Late 2013 i5-4570S 2.70GHz 8GB RAM 240G SSD FHD Online | Technology Locker
OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)
Apple iMac 21.5" Core i5-4570R 2.70 GHz, 8GB RAM, 1TB HDD, 10.15.6 Lat – PC Retro Shop
I got a FREE 2013 iMac 21.5 with internal upgrades including Samsung evo ssd and 16gigs of ram. Then used open legacy patcher to install Mac OS Venture 13.5 beta. : r/osx
Apple iMac 21.5-inch and 27-inch (Late 2013) reviews | Macworld
iMac | 3.1 GHz Intel i7 | 21.5 Inch | Late 2013 - Techable.com