I'm also using a cotton wicked coil right now. You do have to make them yourself, or you can rewick a stock head or a previously built head. If I want to replace the current wick I just pull the old wick out with tweezers or something, the I use a little scrap of wire like a needle threader to pull a small bit of cotton ball through the coil. I use another bit of cotton ball for the flavor wick. You can't dry burn a cotton wick, so to dry burn you have to take the old wick out, then dry burn, then put a new wick in.
I have to look into this. I like the idea of using cotton. When a coil breaks, is it the wick that breaks or the heating element? Can one just buy a coil and replace the wick every week or so and keep the coil indefinitely?