The Carver I imported from an online shop. It's stiff, thick, heavy wire though. Ever see the R1000+ 15 foot Fender cables? They used Carver cable. I saw those and found out where to get the loose cable for much less.
The Neutriks I get from Bothners, the distributor is in JHB somewhere and AFAI concerned, any pro music store should have them (and the XLRs).
I also use Neutrik jack sockets in my guitars:
They are large (the same size as a chassis-mount XLR socket), but last forever. They lock the jack in until the red button thing is pushed in. When they get dirty inside, undo the single screw in the red sleeve at the back and they come right apart. Once you've cleaned them, they reassemble just as quickly and easily.
Careful of data cables - YMMV. They are good for the intended purpose which is working with much higher frequencies, but they may not work as well for audio. They are designed and tested for frequencies we don't use, and are not tested at frequencies we do. They are also usually quite inflexible, more for permanent/semipermanent installations.
Audio cables are designed to take punishment - the thick PVC outer covering is there to protect, while still being flexible. Twisted pair is good for short lengths, but it increases stiffness, crosstalk and capacitance over the longer lengths we use. I twist the wires in singlecoil guitars that don't use screened cable - it's the next best thing.
