The reason you can't find one that long is because, in theory and in my personal opinion, you shouldn't run DVI longer than 12-15 feet. Signal loss/interference would overcome the benifits of using DVI. I believe I have an article on this ... I will try to dig it up and post shortly.
In my opinion, if you need to go 35 feet ... I would get the (2) 15 foot cables connecting them in the middle by a line amp and somehow try to shave 5 feet off the equation.
You could always call someone like Extron, Comprehensive, etc. and see what the cost would be to build you a 35' cable?
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