I've not come across any reasonably price cable as supple and pliable as the original that comes with the DR150. They can be bought, but they are expensive. It shows what a joke the price of some cables are, when the same cable that comes bundled with headphones costs nearly as much as the headphone themselves.
The one mentioned by Krono5 doesn't look pliable. Heck, some people have complained that what is pictured, is not what you get. From my experience, you can't get a cable as nice as the DR150 one, unless you cough up. Shame.