Microsoft Store offers the 4.62-lb. Lenovo G50-80 Intel Haswell Core i5 2.2GHz 15.6" Laptop, model no. 80E501U3US, for $399 with free shipping. (Select "PC Only" to see this price.) That's $200 off and tied with last week's mention as the lowest total price we've seen for any Core i5-equipped 16" Lenovo laptop. (It's a current low by $21.) It features an Intel Core i5-5200U 2.2GHz Haswell dual-core processor, 15.6" 1366x768 LED-backlit LCD, 6GB RAM, 500GB hard drive, 802.11n wireless, Bluetooth 4.0, DVD burner, 4-cell battery, and Windows 8.1.
If you haven't yet, text the word "MSSTORE" to 29502 to receive a 5% off coupon code that knocks the price to $379.05. (It can only be used once per account.)