Lenovo offers its Lenovo B40-30 Intel Pentium 2.7GHz 21.5" All-in-One Desktop PC, model no. F0AW0002US, for $599.99. Coupon code "USPB42US226" cuts the price to $519.99. With free shipping, that's $180 off and the lowest total price we could find. Features include an Intel Pentium G3240T 2.7GHz dual-core processor, 21.5" 1920x1080 (1080p) LED-backlit LCD, 4GB RAM, 1TB 7200 rpm hard drive, DVD burner, 802.11ac wireless, Bluetooth 4.0, and Windows 8.1 64-bit. Deal ends March 5.