I'd also totally recommend Dark Matter. They have a great subscription right now that, IMO, is fairly approachable, but still interesting enough for folks who are into unique coffee. They also have one of the best supply chains I've run into - 2-day shipping to most places, so you're getting really fresh coffee. Turns out Chicago is nice for that.
Madcap is also excellent, as well as Tandem, Wild Gift, Ritual...
On the other side, if you're not aware, you might take some flack for working with Four Barrel, since they've had fairly public issues with their founder sexually harassing folks, and then further shadyness: https://www.sfchronicle.com/restaurants/article/Four-Barrel-...
Madcap is also excellent, as well as Tandem, Wild Gift, Ritual...
On the other side, if you're not aware, you might take some flack for working with Four Barrel, since they've had fairly public issues with their founder sexually harassing folks, and then further shadyness: https://www.sfchronicle.com/restaurants/article/Four-Barrel-...