16GB 2X8GB RAM Memory for Apple MacBook Pro A1398 Black Diamond Memory Module DDR3 SO-DIMM 204pin PC3-10600 1333MHz Upgrade - Walmart.com
Restored Apple A1398 MC975LL/A 15.4" MacBook Pro, Mac OS X 10.11 El Capitan, Intel Core i7-3615QM Processor, 16GB RAM, 256GB Solid State Drive (Refurbished) - Walmart.com
Logic Board 2.7ghz I7 Quad 16gb RAM for 15" MacBook Pro Retina A1398 Early 2013 for sale online | eBay
Refurbished 2015 Apple MacBook Pro Quad Core i7 2.8 15" Dual Graphics 16GB RAM 2TB SSD MJLU2LL/A A1398