I have the gravity hammer, mauler, missle pod, and rocket launcher that I have put into my CNC software, but I have most of the weapons in 3D, so if you want one that is not posted, let me know and I will get it into the software.
Obviously the ones that are full 3D (as in a model replica) are going to be about twice as expensive (twice the cutting) as the ones that could be cut as a plaque.
For you guys I will do engraving for free, and we can make this as custom as you want, the CNC will do anything that I can program and more on 3 axii
Size will also be a factor in the pricing, but unless you are going to go full scale with it, then it shouldn't be to pricey (compared to if I just charged you straight machining time)