What brand is Costco's coffee?

I'm curious to know, what brand of coffee does Costco sell in their stores? As a frequent shopper at Costco, I've noticed that their coffee is always of great quality and reasonably priced. However, I've never been able to find out the specific brand name behind it. Is it a house brand exclusive to Costco, or do they source it from a well-known coffee company? I'm eager to learn more about the origins of this delicious brew.