I was reliably able to get them at Paulina Meat Market without advanced notice a couple years ago when I lived nearby. The only caveat is they don't like to saw

I was reliably able to get them at Paulina Meat Market without advanced notice a couple years ago when I lived nearby. The only caveat is they don't like to saw them when it's busy or close to closing time. So if you don't have a bandsaw, go off hours