The second best option is to use a Champion juicer, which is slow grind and cold process just like a norwalk, but you take the screen plate out and just pulp it. Then you buy a hydraulic press and squeeze the pulp using a norwalk filter bag. You can find the hydraulic press on the Gerson site. I think the press is about $150 US and a Champion is about $180, but don't quote me on that. This then gives you the same process as a norwalk.
And yes, I have a wheat grass juicer, but I like the volume of the other juice, the wheat grass is so concentrated and I can slam a quart and a half of the other recipe at a time because it actually tastes good!