How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
Make Offer MacBook Pro 13 Mid 2009 (A1278) Intel Core 2.26Ghz Max RAM 128GB SSD | eBay
CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core 2 Duo 2.8 17" Mid-2009 - A35 at Amazon.com
Apple MacBook Pro (A1278) 13.3" 2.3GHz Core 2 Duo 2GB RAM 160GB HDD - Mid 2009 885909296552 | eBay
A-Tech for Apple 2GB DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM Module for MacBook, MacBook Pro, iMac, Mac Mini - (Late 2008, Early 2009, Mid 2009, Late 2009, Mid 2010) Models at Amazon.com
A-Tech 16GB Kit (2x8GB) DDR3 1066MHz / 1067MHz PC3-8500 SODIMM RAM for Apple MacBook (13 inch, Mid 2010), MacBook Pro (13 inch, Mid 2010), iMac (27 inch, Late 2009), Mac Mini (Mid 2010)
MacBook Pro: How to remove or install memory - Apple Support
RAM Upgrades For Apple MacBook (2009 - 2010) from OWC
Apple MacBook Pro 13″ Intel Core 2 Duo (Mid 2009) | Dynemac
MacBook Pro 17" Mid 2009 4GB RAM 500GB HDD 2.8GHz Intel core 2 duo (DEVICE ONLY) | eBay
A-Tech 4GB PC3-8500 DDR3 1066/1067 MHz RAM for MacBook, MacBook Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) | 204-Pin SODIMM Memory Upgrade Module at Amazon.com
MacBook Pro Mid 2009 13" Intel Core 2 Duo 2.26GHz 4GB RAM 128GB SSD, El Capitan | eBay
MacBook Pro RAM Upgrades (Non-Retina) - OWC
MacBook Pro Mid 2009 Core 2 Duo 2.26 GHz 8GB RAM 256 GB SATA - Best for parts | eBay
Apple Macbook Pro Mid-2009 13" 2.5Ghz Core 2 Duo *No HDD/RAM* – MSU Surplus Store
How to Upgrade MacBook Pro RAM, Early 2009, 17-Inch: EveryMac.com