Lots of great replies on where to get your silica wick. hehe.
Gotta add my 2 cents on using cotton also. I've found that by replacing the wick every week or two,
and doing a dryburn before re-wicking, the coil actually lasts a very,
very long time.
As a matter of fact, at around 2-3 bucks for a new head, like the vivi and the "stardust V3"
clearos use, after a couple months of re-wicking I won't even bother wrapping a coil.
I have recoiled but find working with such small bits very tedious.
There is a post in my blog on what works best for me on re wicking with cotton.
It's NOT hard, just a tad fiddly.
Cheers

