Try finding a local farmer. I get my pork belly and lard from a guy near my town who raises his pigs sustainably and chemical free. meat producers and farmers can get you custom cuts straight from the place they have their animals processed.

check out:
CISA website - buylocalfood.org
or
localharvest.org

I've been using Maseca masa harina in an attempt to make good tortillas but have failed every time. Followed the recipe (water, salt, masa), put in on a heated cast iron skillet but they become dry and brittle. Added water to dough but still off. I just fry them now in lard, which is far from the worst way to go but I'd like to get the real thing. Tips anyone?