HP ProBook 6550b 15.6" Widescreen Laptop - with Intel i5-520M 2.4GHz, 4GB RAM, 128GB SSD Hard Drive - Windows 7 Professional 64 - Used with FREE 3 Year Warranty provided by CPS. - Walmart.com
Seifelden 8GB (2X4GB) Memory RAM for HP ProBook 6550b Laptop Memory Upgrade - Walmart.com
Memory RAM Upgrade for HP ProBook 6550b 4GB DDR3 SODIMM | eBay
Arch Memory 4GB 204-Pin DDR3 1333 MHz So-dimm RAM for HP ProBook 6550b at Amazon.com
HP Probook 6550b Intel Core i5 2.4 Ghz 8GB 500GB DvD Rewriter, Wifi, Camera 15.6 inch Screen, Intel HD Graphics Windows 10 pro 64bit - Online at Best Price in Singapore only on ElectronicsCrazy.sg
8GB (4GBx2) Team High Performance Memory RAM Upgrade For HP - Compaq ProBook 4311s 5220m 6550b 6555b Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com
8GB 2 X 4GB Memory for HP ProBook 6550b DDR3 PC3-10600 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
8GB [2x4GB] DDR3-1333 RAM Memory Upgrade Kit for The Compaq HP Probook 6550b (WZ241UT#ABA) (Genuine A-Tech Brand) at Amazon.com