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
Memory Upgrades for Apple iMac 2009 - Up to 32GB
Apple iMac 21.5 2009 3.06Ghz UPGRADE 8GB-RAM 1TB-HDD DVD OS10-15-7 One-owner Box | eBay
Apple iMac (27-inch, Late 2009) Serial Number Lookup - AppleSN.info