Amazon offers the 4.6-lb. Lenovo G50 Intel Haswell Core i3 1.9GHz 15.6" Laptop, model no. 59421807, for $354.99 with free shipping. That's the lowest total price we could find by $124. It features an Intel Core i3-4030U Haswell 1.9GHz dual-core processor, 15.6" 1366x768 LED-backlit LCD, 6GB RAM, 500GB hard drive, DVD burner, 802.11n wireless, Bluetooth 4.0, USB 3.0, HDMI, 4-cell battery, and Windows 8.1 64-bit.
Orders placed by December 19 will arrive in time for Christmas. (That deadline is December 22 for Prime 2-Day Shipping.)