Automatic Snapping Machines

I used one when I played in college. I liked it. I am the QB coach at a HS now, and have been trying to get my head coach to purchase one. It makes the QB keep his hands under center when he is doing this such as 7 on 7, so it times things up more realistically. It also helps them keep bottom hand pressure so that their hands don't separate and grab for the ball. I am not sure where to get one, but if you can get ahold of an equipment catalog it should have them. If not, do a search on the net.