newegg offers the 3-lb. Acer Aspire S3-391-6407 Intel Core i3 1.5GHz 13.3" Ultrabook
, model no. NX.M10AA.009, for $549.99
for shipping. That's the lowest total price we could find by $53 and a very low price for such an Ultrabook with a 128GB SSD. It features an Intel Core i3-2377M 1.5GHz Sandy Bridge dual-core processor, 13.3" 1366x768 LED-backlit LCD, 4GB RAM, 128GB SSD, 802.11n wireless, Bluetooth 4.0, USB 3.0, 3-cell battery, and Windows 8.
Note that no optical drive is included.