99% of the folks here do not brew organic. A small but vocal portion of them are outright hostile to it, which is a little baffling.
I brew using organic grains and hops. It is more expensive, no doubt. If you can buy your grain in bulk, that helps cut costs, as well as buying hops in larger quantities when they are on special. For normal sized beers, my costs range from $13 - 18 for a five gallon batch, which i think is pretty reasonable.
The best online source of info and supplies I've found on organic brewing is Seven Bridges Co-op www.breworganic.com. I buy organic malts from Mid Country Malt http://www.countrymaltgroup.com/ because I can pick it up locally. There's a guy in Minneapolis who does a pretty interesting organic brewing blog at http://www.beardedbrewing.org/ Another sometimes interesting blog is www.beeractivist.com written by Chris O'Brien. He has a thought-provoking book out http://www.breworganic.com/fermentin...etheworld.aspx
But your ending question "is it worth it?" is a great question. It depends entirely on why you are brewing organic, in my opinion. For example, I do not harbor any illusions that my organic beers are any better than someone else's non-organic beers. I brew organic because I like to support sustainable agriculture, because I think it makes my beers distinctive, and because it supports my goal of making handmade, artisanal beers.
If you have any specific questions about organic ingredients or recipes, don't hesitate to ask.