Refurbished Apple MacBook Pro 13.3-inch, Intel Core i5, Intel HD Graphics 4000, 4GB RAM, 500GB HDD, Silver, 180-Day Warranty, Bundle Included, and Free 2-Day Shipping - Walmart.com
4gb, RAM 4 Mk Pro R; €8.30 netint.com
4GB Ram Memory (PC3L-12800, DDR3 1600MHz) for Apple MacBook Pro 15 inch A1286, 13 inch A1278 . iMac 21.5 inch A1418 , 27 inch A1419 , Mac Mini A1347 ( Mid 2012 - Mid 2015) - MacWave
Apple MacBook Pro with Retina Display (13-inch, 2013) review: Not a Retina MacBook Air, but awfully close - CNET