A-Tech 32GB (4x8GB) RAM for Apple iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
Bought a mid 2010 iMac at goodwill for 15$. It works technically.... : r/mac
Apple iMac 27-inch, Mid 2010 Memory 4 GB. Not Used Since 2015 | eBay
iMac 27" Mid 2010 i7 CPU 20GB ram 1TB HD, OSX High Sierra, 4k USB camera giving garbage pattern on camera feed to Lightburn - LightBurn Hardware Compatibility - LightBurn Software Forum
32GB (4 x 8GB) PC10600 DDR3 1333MHz SO-DIMMs Memory Compatible with 2011 MacBook Pro, Mid 2010/2011 21.5" & 27" iMac Models, 2011 Mac Mini (OWC1333DDR3S32S) at Amazon.com
How to upgrade RAM / Memory on a 2010 iMac Core i3 i5 i7 (21.5in & 27in) - YouTube