Arch Memory 4GB 204-Pin DDR3 1333 MHz So-dimm RAM for HP TouchSmart 600-1268hk at Amazon.com
HP TouchSmart 600 - HardwareZone.com.sg
HP TouchSmart 23" Full HD Touchscreen All-In-One Computer, Intel Core i3 i3-370M, 4GB RAM, 1TB HD, DVD Writer, Windows 7 Home Premium, 600-1350 - Walmart.com