OFFTEK 4GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkPad W500 Series (DDR3-10600) Laptop Memory at Amazon.com
8GB (2X4GB) RAM Memory 4 IBM Lenovo ThinkPad T500, W500 Notebook Series A35 | eBay
8GB (4GBx2) Team High Performance Memory RAM Upgrade For Lenovo ThinkPad T510 Series W500 Series Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com