Neat idea, but has no practicality for me.
I certainly use a knife more often than I use a comb. In fact I can't remember the last time I used a comb.
It reminds me of the paperboy in the movie "Better Off Dead" who had a switchblade with a comb where the blade would be.
Sorry, David, I don't know where you could get one, but I will keep my eyes open. Maybe he got it at a local fair... that is the only place I ever saw the switchblade combs for sale.