Grist mills

Has anyone purchased flours ground at a mill, or have a local source to purchase some? I've been leafing through one of my bread books, and it calls for some somewhat unusual flours, like a stone-ground rye flour. Maybe I haven't looked hard enough, but I have a suspicion I won't find that too easily.

I've been Googling, but would like to get some opinions here too. Thanks!

Karen