@Paleotron
While "meatsharing" is sorta catchy. :) I think most people refer to it as "cowpooling". If you google "cowpooling chicago", this is one of the articles that comes up:
http://chicago.timeout.com/articles/restaurants-bars/70212/cowpooling
http://chicago.timeout.com/articles/restaurants-bars/70212/cowpooling/2.html
American Grass Fed Beef, Doniphan, MO (866-255-5002).Quarter (100lbs) $550 pickup/$700 delivered; Half (200lbs) $950/$1,250; Whole (400lbs) $1,660/$2,200.
Bauer Custom Meats, Mineral, IL (309-288-5110). Whole Angus (600lbs) $2,103; whole Dexter (350lbs) $1,236.
Cedar Valley Sustainable Farm, Ottawa, IL (815-431-9544). Whole Angus, grain-finished (540lbs) $2,400; Whole Angus, milk and meadow–fed (350lbs) $2,105.
Flying S, Palestine, IL (618-586-2488). Quarter (105lbs) $563, half (210lbs) $1,050.
Nature’s Pasture, Auburndale, WI (715-952-4370). Mixed quarter (105lbs) $685; half (210lbs) $1,275; Whole (420lbs) $2,450.
SS Backwards Longhorn Meats, Medora, IL (618-729-2004). Quarter (100lbs) $275; half (200lbs) $555; whole (400lbs) $1,120.