G-NIUS, Israeli defense company builds this Guardium UGV (unmanned ground vehicle), it designed for border patrol and recon missions. It can receive GPS coordinates and adapt to the pre-programmed routes on the fly. Though it carries only cameras and recon gear in the video but the company says it can equiped with weapons or some modular systems.
Source: G-NIUS
This steampunkified Nerf gun was for sale on eBay, the winner got it for $455 + $35 shipping cost. More hi-res pics and long description in the source link after the jump.
Source: eBay