Gigabyte ATI Radeon HD 6450 Silent GV-R645SL 1GB PCI-Express Video Card for $22.99 shipped after a $20 rebate.  Here is a screenshot for your reference.  It features an AMD HD 6450 GPU which includes integrated support for HDMI, DVI, VGA, digital sound, and more. It also includes a low profile bracket.  Most places have it for about $50.