iMac 24-inch (Mid-2007) Core 2 Duo 2.4GHz - HDD 320 GB - 1GB | Back Market
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
Apple iMac 20" Mid 2007 2.5GHz T9300 4GB 667MHz 500Gb OS 10-15-7 One Owner Boxed | eBay
How to upgrade the RAM on the 27-Inch iMac (2020) | AppleInsider