I got a BB gun @ Walmart for $25 that works great. Its a multi-pump
unit but I don't want to physically harm the cats - YET - so one to
two pumps max is enough depending upon how far away they are. Even
hitting near them makes them haul butt.

I wouldn't want the BBs in the yard though -- not with two little ones
running about. Hopefully the Scarecrow Sprinkler will do the trick. I
found them on EBay for $45 which is not bad -- one should suffice to scare
the daylights out of the neighborhood cats.

James