OWC 6GB (2GB + 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with Late 2008, Early 2009, Early 2010 MacBook, MacBook Pro Unibody Models, 2009/2010 Mac Mini, 2009 iMac Models at Amazon.com
How to Upgrade Mac Pro Memory (Early 2009/MacPro4,1): EveryMac.com
Apple iMac 20-inch Early 2009 2.66GHz Intel Core 2 Duo (MB417LL/A) – UNICOM, Inc.
A-Tech for Apple 4GB Kit (2X 2GB) DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM
iMac 24-inch (Early 2009) Core 2 Duo 2.66GHz - HDD 640 GB - 4GB | Back Market
8GB kit (2x4GB) DDR3 1066 SODIMM for Apple iMac (2009), MacBook Pro (2 – Aplus Technology
iMac Intel 20" Early 2009 EMC 2266 - used original spareparts for Macs
Early-2009 iMac 24" for only $35! : r/mac
Early 2009 duo core (square mac) now running High Sierra patch from Dosdude1 flawlessly. : r/mac