450ohm commercial balanced line

[VK5ACZ]

I need 5mtrs or more of commercially made 450ohm feedline. Hopefully somebody has an offcut. I have previously made my own but in a project I'm developing the commercial product would be difficult (and tedious) to reproduce. I need very frequent spacers. Even a length of the 'dumbbell' style 300ohm TV feedline would work for an experiment.
If anyone can help please email me at VK5ACZ@wia.org.au.
Geoff