I recently switched to using the vivi nova
tanks. I asked them at Good Vapes if they carried wick and they said they do, but that since they just moved (over the past weekend) it's still packed away. They said in the next week, as they get everything unpacked, that they should have both wick and wire.
Good Vapes was at a hard to find location on Forest Lane, but they moved last weekend. Now they are now at Plano Road, just barely north of NW Hwy. Very visible, with more space than they had before.
Good Vapes - Dallas TX - An Official Joyetech Distributor Electronic Cigarettes
As someone suggested above, I would expect DFW Vapor to carry that sort of thing. Possibly vaporesence and Vapors Lounge, too. Dallas has a number of conveniently located vape shops.