ST Ali currently have their Wide Awake and Orthodox Blend cold brew coffee in 2L goon bags on sale.
Previously when I've purchased them they've had 6 month expiries with the recommendation to consume within 2-3 weeks of opening. You can easily get 50 serves out of these and I use them for both the office (cheaper than buying from the cafe) and for cocktails as well.
Free shipping for orders over $79.
You know, you can buy these full of wine for cheaper!