What sort of length are you looking for?
A manufacturer of mine makes a cable that has 2 x CAT5e's and a Sky / CAI approved Coax attached to each other.
The advantage of it is that is comes as a ribbon, looks like this 0-O-0 that wil roll into a triangular shape and fit through a 12mm hole.
Also where are you based? As I would need to supply via one of my installers