Depending on you location & if you want bulk or bagged coal, there are many good names, & some not so good. I'm in Mass. & use bagged coal & find Blaschak is very good coal.
This link is broken, either the page no longer exists or there is some other issue like a typo.
I've never read any bad reviews of Blaschak here. For bulk, if you can get it, Superior seems to get the best reviews. Avoid Reading Coal or "mystery" coal. (unmarked bags)
Good luck with your stove...It's a good one.