This is a great article
http://tkranch.com/faq/grassfed-beef.html
As a producer, grass
finished beef is by far the most expensive way you can raise cattle. If you're going to price it out, keep that in mind. It's also by far the healthiest option, so in this case you're getting what you pay for.
Like the article says though; there is a BIG difference between grass FED and grass FINISHED. If you're looking into it, make sure you understand the distinction because grass fed (at least in my opinion) is no different than a steak you buy at Safeway.