I need a new cable and its a pain in the ass to find one, because the cable opening is built inside the headphones. The opening is really small. Both cables I bought so far were to big.
Studio's headphone cable features a compact connector design which reduces bulk and eases unnecessary strain that can damage headphone connectors and ports.
Goto radioshack, they should have this cable. The name should be something similar, but I seen it at my local store before.
I also did a quick search on ebay with "micro 3.5mm", it show some results but I can make out if is the smaller ones.
I guess this will help you out
http://www.proaleo.com/3-5mm-replacement-mini-jack-l-cable-for-monster-beats-dr-dre.html
or
http://www.proaleo.com/3-5mm-replacement-coiled-red-mini-jack-cable-for-monster-beats-dr-dre.html