Chopping Chocolate

I have a small business where I manufacture and sell a line of brownies. I've been using blocks of chocolate, shaving them and then melt with butter for my brownies. The problem is when I was doing low volume the chopping was not a big deal, but now it is. It is a complete time killer. My current supplier does not offer chips and I don't want to switch. Does anyone know of a machine that can chop large chunks of chocolate and if so where can I get one?