MacBook Pro: How to remove or install memory - Apple Support
Apple MacBook Pro 13.3" MD102LL/A Mid 2012 - 8GB RAM - 750GB HDD - 2.9GHz Intel Core i7-3520M (Scratch and Dent) - Walmart.com
Samsung ram Memory Upgrade DDR3 PC3 12800, 1600MHz, 204 PIN, SODIMM for 2012 Apple MacBook Pro's, 2012 iMac's, and 2011/2012 Mac Mini's (8GB kit (2 x 4GB)) at Amazon.com
Replace your 2009-2012 MacBook Pro HD with an SSD
Upgrade your MacBook to an SSD (pictures) - CNET
How to Upgrade RAM on MacBook Pro, iMac & More | AVG