Hynix HMT451U6BFR8C-PB 8GB 2 x 4GB PC3-12800U DDR3 1600 CL11 Desktop Memory Kit 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