has Vortex Line now has all six of the Nerf Vortex line products on their website!  Right now the Nitron is ready to preorder but the rest say that they are "out of stock" but will arrive shortly.  Some of the products are slightly overpriced, but lower than TRU.  The site indicates that they are available at some Kmart stores, but not mine.
This is the first time I've seen the refill pack for sale anywhere.  Also, the picture of the Vigilion is wrong.  It shows a picture of the Proton.  Oh, well.  Mistakes happen.

Happy Nerfing!