Dell Small Business & Home Office once again offers the Dell OptiPlex 580 DT AMD Athlon II Dual-Core 3GHz Desktop PC (no monitor) for $299. Coupon code "9LCDVNKFWTPT9P" cuts it to $269. With free shipping, that's tied with our expired mention from three weeks ago as the cheapest non-refurb price we've seen for a Dell OptiPlex desktop with a dual-core CPU. Sales tax is added where applicable. Features include an AMD Athlon II 250 3GHz dual-core processor, 2GB RAM, 250GB 7200 rpm hard drive, DVD burner, mouse, keyboard, and Windows 7 Professional 32-bit. Coupon expires December 31.