$10USD from the EDM website on its own, or if you get their kits, you can drop the price to just under $6USD.
Kabuki's are mainly used for your mineral foundation. They work the best with mineral foundation. They pick up an evenly distributed amount of the foundation to be lightly buffed into your face. The hairs are VERY soft, and are synthetic. Personally because they are synthetic, I find that they dry quite fast, though others say that it can take almost up to a full day. I have owned mine for over 6 months now, and have experienced no shedding, or any other problem.
If you are looking for a decent started brush, one that really lives up to its name, I would strongly recommend this brush. (If you need more coverage, I would then strongly recommend that you look into the flat top kabuki from EDM instead. That's another one of my favourites :P )