Some of the local breweries sell grain but I’ve never bought from them.
I usually order online from Great Fermentation, Atlantic Brew Supply, More Beer, Northern Brewer, etc…
*Disclaimer*: Any comment I add is simply the way I brew beer. I am not paid or sponsored by anyone. There are certainly other ways that can be equally effective which other brewers may contribute. This is what I’ve found that works for me using my equipment and processes so I offer this for your consideration. YMMV