I picked up an optical cable and a stereo analog cable from Monoprice recently. The optical cable was of serviceable quality, but the analog cables were as flimsy as anything I've seen included with a cheap VCR - no shielding, small gauge. I think it varies depending on the cable, since mine were at the extremely low-cost end of the spectrum. You might also take a look at Blue Jeans Cable for the component and analog cables and Pacific Cable for the DVI/HDMI stuff.