I can get hold of raw wild game muscle-meat(moufflon, wild boar, wild mallard duck) with ease, here in Vienna, Austria. Raw organ-meats(dry marrow(the worst kind), raw etc. brain, heart, liver, kidney I can get from standard supermarkets. The organs are not 100% grassfed, but Austrian farming is much less focused on intensive farming.
Basically, if you have the resources, either go in for a hunting licence and get your whole wild game carcasses that way, or grow your own food(eg:- chickens) in your own backyard, for the best results.