As always, an easy place to shop is
http://www.audioadvisor.com They have Munster, MIT, Tributaries. I recently bought some MIT component video cables (the AVt 1). They are silver coated copper, true 75 Ohm, and look amazing. Got a screamin deal on them as well. I'm still tweaking my picture right now, but am enjoying them quite a bit.
Anyway, I know AudioQuest and Analysys Plus both make a DVI cable.