NEMIX RAM 16GB (2x8GB Upgrade) DDR3-1333 PC3-10600 204-Pin SODIMM Memory for Apple MacBook Pro Early/Late 2011, iMac Mid 2010 27 inch 4-Core, iMac Mid 2011 21.5/27” , Mac Mini Mid 2011 at Amazon.com
Apple iMac 21.5-inch Mid 2010 3.06GHz Intel Core i3 (MC508LL/A) – UNICOM, Inc.
Bought a mid 2010 iMac at goodwill for 15$. It works technically.... : r/mac
Amazon.com: Timetec 32GB KIT(4x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for iMac (Mid 2010 27 inch, Mid 2011 21.5/27 inch) SODIMM Memory Module MAC RAM Upgrade for iMac 11,3 / iMac 12,1 / iMac 12, 2 : Electronics
Apple iMac 21.5" - Early 2010 Reviews, Pros and Cons | TechSpot
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET