Apple iMac 2007 A1224 MA877LL/A 20" C2D 2.4GHz 4GB RAM 320GB HD DVDRW El Capitan 885909150335 | eBay
A-Tech for Apple 6GB Kit (1x2GB + 1x4GB) DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook (Late 2007, Early 2008, Early 2009), MacBook Pro (Mid 2007, Early 2008), iMac (Mid 2007) - Memory RAM Upgrade at Amazon.com
CMS 4GB (2X2GB) DDR2 5300 667MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac (Mid 2007) Pc2-5300 - A37 at Amazon.com
Apple iMac 20-inch 2007 2.0GHz Intel Core 2 Duo 4GB RAM 250GB MA876LL El Capitan for sale online | eBay
MemoryMasters 6GB (4GB + 2GB Memory Upgrade Kit) Memory RAM for Apple iMac 2007 7,1 at Amazon.com
iMac 20-inch (Mid-2007) Core 2 Duo 2.4GHz - HDD 320 GB - 2GB | Back Market
6GB Memory for 2007-2008 MacBook Pro, MacBook, and iMac