Where can I get cheap shielding wrap?

[Vertigo]

The video from both of my RGB-modded N64s flicker.
I did one, the other was already modded in a shop.
I believe they flicker (at different rates of flickering depending what the N64's doing) because the wires are too close to the gubbins and are badly shielded.
The solution seems to be either aluminium or copper wire wrap, with copper supposedly The Good Shit but at extortionate rates.
Can anyone recommend where I can get a very short quantity for cheap or a servicable alternative?
I've looked, can't find, but you people know stuff.

Ta x