I know this is a bit late but try this place:
AT uses these cables for the projectors in our classrooms.
Ryan Wilkerson wrote:
> Is there a place in town where I can get supplies to make a 50' long VGA
> cable? We are trying to install a projector in the ceiling of our
> conference room. The cable will have to run through conduit into a floor
> box so I can't use a pre-made one since the ends will be too big. Any