Author of "The Automatic Millionaire," David Bach, coined the term, "The Latte Factor," which basically says that if you ditch your $4 latte every morning, you'd have quite a bit of money to contribute towards savings — about $30 a week, or $120 a month. Over the course of a few decades, that money could grow substantially.
Rather than hitting up Starbucks every day, consider investing in a nice coffee maker, even if the price tag is a bit steep — overtime, it'll save you in the long run.
(And note that while Bach calls it "the latte factor," the same applies if you buy a daily muffin or smoothie or a few sodas. If you're in the habit of mindlessly spending a few unnecessary bucks per day, that money would be better used in savings.)