iMac 21.5-inch (Late 2009) Core 2 Duo 3.06GHz - HDD 1 TB - 4GB | Back Market
Can the Late 2009 27" iMac handle 32GB of RAM? | MacRumors Forums
ram for late 2009 imac model | Newegg.com
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Max Memory Upgrade at Amazon.com