I know Clancey's makes and sells their own...anywhere else?
Coastal always has Fish stock, sometimes chicken stock and shellfish stock as well. They are all pretty well managed on the salt levels, which I have found easy to control and cook with. I also have good luck with the Chicken stock at Seward Coop. All frozen at both locales.
74 Snelling Ave S, St Paul, MN 55105
Seward Co-op Grocery and Deli
2823 E Franklin Ave, Minneapolis, MN 55404
2330 Minnehaha Ave, Minneapolis, MN 55404
grabbed some from Heartland, I hadn't seen the new place yet, the market is nice. good selection of meats too. the stock was a bit pricey there though $8/quart.