Wear your dirtiest torn ass shit, walk around where the tents are in your town, scratching every now and again, and ask anyone that looks like a crust punk, or houseless person "dya know where to get any dark? I really really need to get well"
or if they already know you because you've lived around them and gotten the spicy flonase like 3 times publicly like me the'll likely point you the way of the person who will get you more with a "welcome back" just depends on if you're looking for really clean shit i guess