Martelli makes one, it's called the Kwik Bind System and it's just shy of $150. I know it is for 1/2" as opposed to 1/4" binding but you see both sides at the same time. It also comes with a DVD as well as written instructions. I don't have one but have seen it demoed and know people who use it on their machines and love it. As far as I know, it can be used with pretty much any machine.