I commute about 1 1/2 hours to work (door to door and on the METRO, at least) (I know, the commute itself is a much longer and more convoluted post). By the time I got to work with my made-at-home-and-in-an-insulated-mug-coffee it was lukewarm and I found that by 9:30 I really get to jonesing for a hot cuppa. Our office is not coffee-pot friendly and there is an oh so convenient cafeteria about 100 steps away. It wasn't starbucks, but I was spending about $7/week on coffee.
I combined some Trader Joe's intant coffee (it's really not so bad!), some powdered milk, sugar, and a little ground cocoa powder (mocha!), whirred it in the blender for a bit to combine, and put it in a big mason jar that I keep in my desk. Now when I need a cup of coffee, I put in a few spoonfulls, add water, and microwave my mug. It isn't the greatest coffee I have ever had, but it isn't bad and it costs about $.04/cup. Yearly savings of about $350!
Great for camping, too!
Taylor in DC