Lenovo offers the 3.9-lb. Lenovo ThinkPad X131e Intel Celeron 1.7GHz 11.6" Laptop, model no. 628323U, for $199. Coupon code "CHROMEX131E" drops it to $179.10. With free shipping, that's the lowest total price we could find by $183. Features include an Intel Celeron 1007U 1.5GHz dual-core processor, 11.6" 1366x768 LCD, 4GB RAM, 16GB SSD, 802.11n wireless, webcam, 6-cell battery, and Google Chrome OS.
Note: It doesn't have an optical drive.
Update: Specs corrected