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
Install memory in an iMac - Apple Support
Apple iMac 27" Late 2009 i7-860 2.8GHz 16 GB RAM, 240GB SSD, Radeon HD 6970M 1GB | eBay
:max_bytes(150000):strip_icc()/MemoryPressure-56df45d85f9b5854a9f6b21b.jpg "Memory Upgrades for Your 2009 - 2012 Mac Pro")
Memory Upgrades for Your 2009 - 2012 Mac Pro
Timetec Hynix IC 16GB KIT(2x8GB) Compatible for Apple DDR3 PC3-8500 1067MHz/1066MHz Upgrade for MacBook 13'' Mid 2010, MacBook Pro 13'' Mid 2010, iMac 27''Late 2009, Mac Mini Mid 2010(16GB KIT(2x8GB)) - Newegg.com
A-Tech 16GB (4 x 4GB) PC3-8500 DDR3 1066/1067 MHz RAM for iMac Late 2009 21.5-inch / 27-inch | 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
iMac Intel 24" EMC 2267 (Early 2009) Memory Maxxer RAM Upgrade Kit
Late 2009, 27 inch iMac can use 32 GB of 1333 MHz RAM, beyond what Apple says - YouTube
Apple iMac Late 2009 All in One Pc i7 16gb Ram 2TB HHD 2.8gz Selling as Is | eBay
16GB Memory Upgrade Kit 2009 Apple Apple iMac
Memory Upgrades for Apple iMac 2011 Up to 32GB
Memory Upgrades for Apple iMac 2009 - Up to 32GB
iMac Memory for Models 10.1 and 11.1 | 16GB (4GBx4) | MacMemory.com
Amazon.com: OWC 16GB (4 x 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with iMac 21.5" and 27" (October/2009) : Everything Else
A-Tech 16GB Kit (2x8GB) DDR3 1066MHz / 1067MHz PC3-8500 SODIMM RAM for Apple MacBook (13 inch, Mid 2010), MacBook Pro (13 inch, Mid 2010), iMac (27 inch, Late 2009), Mac Mini (Mid 2010) at Amazon.com
27" Apple iMac 3.06GHz Core2Duo 2TB HD 16GB RAM (2009) - MacUnited
Apple iMac 27" 3.06GHZ (2009) review | TechRadar
APPLE IMAC 21.5" RETINA 4K 2019 INTEL CORE 3.6 GHZ CPU RAM 16GB HDD 1TB COMPUTER | MDG Sales, LLC
iMac "Core 2 Duo" 2.66 24" (Early 2009) Specs (Early 2009, MB418LL/A, iMac9,1, A1225, 2267): EveryMac.com
16GB RAM in a 2009 & 2010 iMac | MacRumors Forums
iMac (late 2009) 16GB RAM upgrade question | MacRumors Forums
Install memory in an iMac - Apple Support
