4GB [2x2GB] DDR2-667 (PC2-5300) RAM Memory Upgrade Kit for The Apple MacBook 13.3" 2.1GHz Core 2 Duo 4,1 MB402LL/A (Genuine A-Tech Brand) at Amazon.com
MacBook - Wikipedia
Apple MacBook A1181 - Mid 2009 - Core 2 Duo 2.1GHz - 2GB RAM - OSX 10.7.5 Lion | eBay
Apple MacBook Pro 14" Laptop M2 Pro chip 16GB Memory 512GB SSD (Latest Model) Silver MPHH3LL/A - Best Buy
Apple | Computers, Laptops & Parts | Apple Apple Macbook A181 21ghz 1gb Laptop Osx White Mac Works | Poshmark
4GB RAM Memory for Apple MacBook MB403LL/A (13" 2.4GHz White) 493, MB404LL/A (13" 2.4GHz Black), MB402LL/A (13" 2.1GHz White) 492, MB404LL/A (13" 2.4GHz White) 494 Black Diamond Memory Module DDR2 S System
Apple Announces New MacBook Pros With M2 Pro and M2 Max Chips, Up to 96GB RAM, and More - MacRumors