I got mine for Home Depot. I went around asking everyone if they sold CableClamps and I even brought in a larger CableClamp I had found at the local Revi. I saw them at a local music store aswell, except they were 3 times the price anywhere else (Planet Waves).
After done asking a guy in the Hardware section if they sold any CableClamps, I turned around and saw a massive bucket of bright orange "CableCuffs". So I bought 10 of them for something like 3 dollers each.
Now my guitar equipment is infinity more organised, and my penis is bigger too.