BrickArms just posted new transparent weapons packs on their site. The packs are available in red, blue, green and clear. You get 34 for $25. I saw the transparent weapons flying of their table at BrickCon, so I would expect these to go fairly quickly.
According to BrickArms spokesman, the ever enigmatic badger, these are color matched to LEGO’s transparent pieces.
Edit: I’ve just been told that they added Chrome Weapons Packs yesterday. The chrome weapons are very sweet. I picked up a couple at BrickCon.