Total Micro 4 GB DDR3 SDRAM Memory Module 55Y3711-TM at Amazon.com
8GB DDR3 SDRAM Memory Module at Amazon.com
parts-quick 8GB 2X 4GB PC3-8500 1067MHz DDR3 Memory Compatible with Apple MAC SODIMM 204 pin RAM at Amazon.com
G.Skill Ripjaws X Series 16 GB (2 x 8 GB) 240-Pin SDRAM (PC3-12800) DDR3 1600 CL10-10-10-30 1.50V Dual Channel Desktop Memory Model F3-12800CL10D-16GBXL at Amazon.com