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My free iMac 27" (2009) core i7 2.8, 32GB, 1TB SSD High Sierra. only cost me a SSD and about an hour of time. : r/mac
Amazon.com: OWC Data Doubler Optical Bay Hard Drive/SSD Mounting Solution for 2009 Mac Mini : Electronics
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Amazon.com: New Internal 2nd HDD SSD Caddy for Apple iMac Core 2 Duo MB952LL/A MB952 Late 2009 A1312 27" Computer SuperDrive Optical Bay Second Hard Drive Enclosure Replacement : Electronics
Amazon.com: Computer 2nd HDD SSD Hard Drive Caddy for Apple iMac 2009 A1225 MB418LL/A MB419LL/A MB420LL/A 24 Inch Desktop PC, Second Solid State Hard Drive Enclosure, Internal CD DVD SuperDrive Optical Bay :
iMac (20-Inch, Early 2009) SSD Upgrade - YouTube
Amazon.com: OWC 1.0TB 3G SSD and HDD DIY Complete Bundle Upgrade Kit for Late 2009-2010 iMacs, (OWCKITIM09HE1TB) : Electronics
iMac (circa 2009) Hard Drive to SSD Upgrade - YouTube