[alephnerd]

It's almost impossible to find hand-milled flour in a store or online.

You might be confusing "Stone Ground" flour which is ground using a machine [0]

[0] - https://www.youtube.com/watch?v=4SolMVg3_Ac

[lukan]

I never tried to buy it myself, but I know I saw it on a organic market (in europe) advertised as such at least once. Basically, a extremely esoteric niché obviously.