Kingston Technology 4 GB Memory for Select Apple Imac's and Macbooks Single (Not a kit) 1066 MHz (PC3 8500) 204-Pin DDR3 SO-DIMM KTA- MB1066/4G at Amazon.com
4gb Ddr3 Ram 1066 Mhz 204pin 1.5v 2r*8 Double Model Sodimm Memory For Laptop Macbook 2009-mid,2010 - Rams - AliExpress
OWC 4GB PC8500 DDR3 1066MHz SO-DIMM Memory Compatible with Early 2009, Early 2010 MacBook, MacBook Pro Unibody Models, 2009/2010 Mac Mini, and 2009 iMac Models at Amazon.com
4GB DDR3 PC3-8500S SODIMM RAM 1066/1067MHz For Apple PC3-8500S 0x80ce 1066MHz | eBay