Forget about replaceable cables. The replaceable cables are usually proprietary, expensive, and sometimes hard to find.Would you want to pay $30 or more for a replacement cable for a headphone that has a list price of $140 but that you paid $40 for? A much better idea is to pay less for the headphone, and replace the whole thing if the cable breaks. Look at the JVC HAS650 for $34 on Amazon, or the AKG K430 for $40 on Amazon.
I could see wanting a replaceable cable on a $200+ headphone, however it really isn't an advantage on a headphone under $65.
Very few headphones under $100 have a replaceable cable.