Free: Contests & Raffles.
That's part of hunting, you can't shoot what you can't see. Next time the fog may give you enough of a break to get a shot.
I carry a wrist rocket sling shot in my pack.In the past I have used it to move game into view for a better look.
I don't know about your area but butt ends work great. The rock thing works occasionally but often doesn't make enough noise. Find yourself a head butt end on a landing and roll it down the hill...if you get some speed they make a hell of a bang. Me and my buddies call it bowling for bucks...it's worked on more than one occasion