HP ProBook 6555b - Quad-Core | multiversetechdeals
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
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