#1.) Get refills! If you keep your Starbucks cup, you can get a coffee refill anytime for 50 cents. If you bring in your own reusable cup, you get 10 cents off. Being green saves some green.
#2.) Get a Starbucks card. Using their rewards card, get free drinks and refills.
#3.) Make it a "poor man's latte." Instead of ordering a latte, order an espresso over ice in a large cup. Then go over to their "condiments" station and fill the rest of the cup up with their free milk.
#4.) Don't order the bananas or bagels. The pastries at Starbucks are pretty good and fairly priced. But the bananas are more expensive than ones you'd get at a grocery store, and the bagels are known to be fairly low quality.
#5.) Make your own iced drink. When you order an iced drink, you get a lot less actual coffee or tea because the ice takes up so much space. For a better value, you can order a hot drink -- then order a cup with ice, and pour in your drink.