Nihari inside the 610 loop…or just outside it AND What’s a good meat market?

A former coworker introduced me to nihari. I have since made it on my own but I would like to try some authentic nihari again to see how close I am. Typically I'll make a lamb or mutton (no brains – I haven't been that adventuresome yet). Googling "best nihari" they all seem far away.

Also, when I asked for a good meat market to buy some lamb bones, someone reminded me of B&W which I used to go to before I moved away from Houston, but what are some other good ones?