Apple MacBook Pro 13" with SSD (Early 2011): Unboxing and Demo - YouTube
Apple MacBook Pro 13-Inch (Early 2011) i5 2.30GHz 4GB RAM 320GB HHD macOS Sierra | eBay
Apple MacBook Pro A1278 Early-2011 13" Intel i5 @ 2.3GHz 8GB RAM 500GB HDD *READ | eBay
Apple MacBook Pro 13.3" Laptop - Early 2011 Model 250GB SSD 4GB RAM | eBay
A-Tech 16GB (2x8GB) RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
MacBook Pro 15" Unibody Early 2011 Teardown - iFixit