A-Tech for Apple 2GB DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM Module for MacBook, MacBook Pro, iMac, Mac Mini - (Late 2008, Early 2009, Mid 2009, Late 2009, Mid 2010) Models at Amazon.com
iMac 24" 2.66GHz (Early 2009)* | mac of all trades
Apple A1225 24-inch iMac Core 2 Duo 2.4 GHz 2 GB RAM 320 GB HDD Early 2009 | RecycledGoods.com
16GB RAM on an iMac 24" (early 2009)? - Apple Community
iMac (2009) RAM & Storage Upgrades
Early-2009 iMac 24" for only $35! : r/mac
8GB Kit (4GBX2) DDR3-1067Mhz for Early/Late 2009 iMac and 2009-2010 MacBook Pro at Amazon.com