Dell Small Business offers its Dell Vostro 3900 Intel Haswell Core i5 Quad 3.2GHz Mini Tower Desktop PC (no monitor) for $599. Coupon code "VOSTRODEAL" cuts it to $524. With free shipping, that's $55 under our December mention and the lowest total price we've seen. (It's the best now by $156.) It features an Intel Core i5-4460 3.2GHz Haswell quad-core processor, 8GB RAM, 1TB 7200 rpm hard drive, DVD burner, Nvidia GeForce GTX 745 4GB video card, and Windows 7 Professional 64-bit with Windows 8.1 Pro license. Deal ends March 31.