Apple iMac 24-inch Mid 2007 2.4GHz Intel Core 2 Duo (MA878LL) – UNICOM, Inc.
4GB 2 X 2GB DDR2 Memory for iMac 7,1 Mid 2007 20" inch 24" inch Intel Core 2 Duo 2.4GHz PC2-5300 667MHz 200 pin SODIMM (PARTS-QUICK) at Amazon.com
An upgrade to my mom's 2007 iMac | Raoul Pop
Install memory in an iMac - Apple Support
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6GB Memory for 2007-2008 MacBook Pro, MacBook, and iMac
Apple iMac 20-inch 2007 2.0GHz Intel Core 2 Duo 4GB RAM 250GB MA876LL El Capitan for sale online | eBay
Apple A1225 24-inch iMac 7.1 Core 2 Duo 2.4GHz 320GB HD 2GB RAM Mid-2007 MA878LL | RecycledGoods.com
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
How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.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