Amazon.com: 2013 Apple iMac with 3.2GHz Intel Core i5 (27-inch, 8GB 1TB Mac OS X) (Renewed) : Electronics
iMac (Late 2013) | Low End Mac
≥ iMac 27-inch| core I5 3.2 ghz Catalina late 2013 — Apple Desktops — Marktplaats
Apple iMac 21.5" Late 2013 Core i5 2.7GHz 8GB RAM 1TB HDD MacOS Big Sur 11.5.7 | eBay
Apple iMac 14,2 Late 2013 A1418 21.5 Intel i5 4570R 8GB 1TB HDD OSX Catalina | eBay
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