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
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Amazon.com: 2013 Apple iMac with 3.2GHz Intel Core i5 (27-inch, 8GB 1TB Mac OS X) (Renewed) : Electronics