IRBT's obvious untapped market
IRBT makes robotic vacuums and gutter cleaners for the civilian market. Why not a side walk and driveway shoveler as well? You crazy folk in the mid atlantic region would sell your first born for a machine like this. Contact IRBT to let them know you want such a device. They might do something about it if the demand is high enough.
Disclosure: I do not own IRBT. But I do have them on my watch list. If they one day build a real life R2D2 I am all over it!