Organic beef is almost always more expensive than regular beef, although it is not necessarily healthier. Some organic beef simply meets criteria for being labeled 'organic', while other organic beef may really be healthier in that the feed the cattle have eaten is better.

Organic means that no chemicals were used to grow the beef.

Organic Beef

You can buy organic beef, as well as other meats, here: http://www.igourmet.com/shoppe/meats_and_seafood.asp?top=top. In addition to meat, they sell organic desserts, fruits, vegetables and desserts.

Your best bet would be to call a kosher butcher in the Chicago area to find out who deals with kosher organic corned beef if there's such a thing available.