Here's the organic ... cotton I use (which is near-identical to KGD):
http://www.amazon.com/Cotton-Labo-ORGANIC-Puff-200pc/dp/B000TCD51A
200 pads for $7.50.... (ships from chinatown though...I got mine within ~2 weeks)
Since getting rxw though, I haven't used anything else ...I haven't needed to build another coil/rewick since...
I decided to go the route of building the coil first, and then "screw" the the wick in, after checking the ohms and firing the coil to check/get rid of hot spots... which is important...
I use the second smallest rod in the artistic wire coil gizmo, which is a little larger than 1/16"- a perfect fit for the 2mm RxW... I like using the coil gizmo jig, because its easy, and it makes a perfect tensioned contact micro coil.
I then cut the wick in a 45 degree angle, with wire cutters (alternatively, you can use nail clippers - preferably new ones, lol)... Then I turn the wick in the direction of the coil wraps, until it catches and keep turning it until its through enough and then trim it... then I insert the smallest rod, that comes with the coil gizmo, into the center of the Rxw, and gently slide it all the way through, to open up the center all the way- its like a garden hose... this method is easy IMO, and works great...whatever works for you though.. here's a pic on how to cut/screw it into an already wrapped coil:
Trick is to cut the 2mm wick on an angle. Study the wraps in the coil and think of the wraps like threads in a nut. You want to twist the wick like it's a bolt going into the threads of a nut. If you twist with the wraps of the coil they pull it through, if you twist the wrong direction then the wraps will try to push the wick back at you.
Look at the leg on the bottom of this coil. If you twist in a clockwise direction, the leg will help tuck the ends in and the wraps will pull it in. Remember it's not always clockwise I could have the wraps going the other way depending on how I make the coil.
I think that this way, there are less things to go wrong: hand-wrapping too tight will destroy the Rxw fibers.. hand-wrapping too loose, will not get a good, snug fit, which will not be the best vape possible...If you are an experienced coil builder, or just very good with kanthal, maybe your results will be great (and I hope they are) on your first try...
Here is a link to a (reo) thread about Rxw, and it is where I learned and got the most up-to-date help:
http://www.e-cigarette-forum.com/forum/reos-mods/539791-readyxwick-non-cotton-people-132.html
Here's how I wrap/install coils:
https://www.youtube.com/watch?v=0XLIHmm5p2Y&list=UULWoUhjf61yHLlCuRfOHPuQ
Just thought I'd throw this out there for anyone new who wants more info, thats readily available, and what has worked easily, for me...
Oh and for anyone who wants to use the 3mm RxW, and wrap the coil first, 2.5mm is probably the perfect size diameter (to wrap the coil around). I received more than a few 2.5mm rods from a generous ECF'er, so if you want one PM me.