There's baker's grade too.Being in the city raw barley animal feed would be more difficult to find
I used to pick up sacks of (pre-milled) pizza flour at a baker's supply outfit. Not all flour is the same, that was certainly the best flour for pizza. They had all kinds of other grain products too.
Sadly, they did not carry malted barley, which was something I was looking for too and could not find. This was in the early 90s trying to get into homebrewing, Charlie Style.