Apparently, I can't find beef offal/liver/bones from grass-fed animals in my town. I also can't seem to find "normal" grain-fed pieces of these specific cuts in my local supermarket. The only place where I can get such cuts is on my local Chinese super-market, which has even lower quality meat than in most popular supermarket chains (super-cheap, and their chicken is always somewhat discolored -- kinda scary shopping there). See, there are two qualities of grain-fed meat: the bad, and the worst. And when it comes to offal, I can only find the worst kind.
So what should I do? Should I continue buying these low-quality-looking beef bones/livers/hearts, or should I scrap them altogether? Are the "good" parts of such food overpower the badness, or the badness overpowers the goodness?
EDIT: I live in the Bay Area (not in SF), but I don't drive. So I buy stuff from places close to my house & town (either by foot, or local bus).