As one of its daily deals, TigerDirect offers the ASUS Zenbook Intel Core i5 1.6GHz 13.3" Ultrabook, model no. UX31E-XB51, for $649.99. This $50 mail-in rebate drops it to $599.99. With around $8 for shipping, that's the lowest total price we could find by $142, although we saw it bundled with an anti-theft service for $8 less and no rebate hassles last month. It features an Intel Core i5-2467M 1.6GHz Sandy Bridge dual-core processor, 13.3" 1600x900 LCD, 4GB RAM, 128GB SSD, 802.11n wireless, Bluetooth 4.0, webcam, 4-cell battery, and Windows 7 Professional 64-bit. Deal ends today.