Dell SNPX830DC/4G 4GB DDR3 SDRAM Memory Module at Amazon.com
OWC 8 GB (2 X 4GB) ram PC8500 DDR3 1066MHz sodimm 204-pin Memory Upgrade Kit, (OWC8566DDR3S8GP), Compatible with MacBook Pro, MacBook, Mac Mini and iMac at Amazon.com
Addon-Memory 1 x 4GB DDR3 SDRAM DIMM 240-Pin AM160D3SR4EN/4G at Amazon.com
4GB DDR3-1066 (PC3-8500) RAM Memory Upgrade for The eMachines EL Series EL1850-01E (Genuine A-Tech Brand) at Amazon.com
DDR3 Desktop RAM, 4GB 1333Mhz High Frequency DDR3 240PIN PC3-10600 Computer Memory RAM 1.5V for Intel/ AMD at Amazon.com
HP 4 GB DDR3 SDRAM Memory Module - 4 GB (1 x 4 GB) - 1333MHz DDR3-1333/PC3-10600 - DDR3 SDRAM - 240-pin DIMM at Amazon.com
Micron MTA4ATF51264HZ-2G6E1 Non ECC PC4-2666V 4GB DDR4 at 2666MHz 260pin SDRAM SODIMM Single Kit Laptop Memory - OEM at Amazon.com