Lenovo offers its 5.5-lb. Lenovo Z50 Intel Haswell Core i5 1.7GHz 15.6" LED Laptop, model no. 59426422, for $579. Coupon code "D2BZ5022703" makes it $549. With free shipping, that's $50 below our mention from three weeks ago and the lowest total price we've seen for this model. It features an Intel Core i5-4210U 1.7GHz Haswell dual-core processor, 15.6" 1366x768 LED-backlit LCD, 8GB RAM, 500GB hard drive w/ 8GB SSD, DVD burner, 802.11ac dual-band wireless, Bluetooth 4.0, webcam, HDMI, USB 3.0, 4-cell battery, and Windows 8.1 64-bit. Deal ends July 23.