The crowd at the USTA Billie Jean King National Tennis Center.   (Photo: Getty Images)

The 7 train is a good bargain, but the free Powerade Zero ferry is an even better one. Departing from 35th Street on the East River, it drops passengers off at the World’s Fair Marina, where a free shuttle bus takes you to the tennis-center gates. Better still, you can fill up on complimentary Powerade Zero while onboard. The only catch? The ferry only runs through September 6. Reserve your seat here.

It’s no secret that the cheapest way to see matches is to buy grounds-admission tickets, steer clear of Arthur Ashe stadium, and check out the side courts—including solid second-tier matches in the Louis Armstrong and Grandstand stadiums. And though grounds admission is only offered through Labor Day, fans will be able to snag $5 passes on the last day to to watch the men’s singles final from the South Plaza on the giant TV outside of Arthur Ashe Stadium.

Start with a snack by picking up freebies at the Nabisco or Oikos organic Greek yogurt stands. Food-court fare can get pricey ($18.75 for Fulton Seafood’s shrimp- and lobster-salad roll!), but, relatively speaking, the $7.50 chicken tikka kati roll from the New Deli Spice stand is modestly priced. (If only it tasted less like a glorified McDonald’s fajita.) To get the most bang for your buck, notable portions can be found at Fresca Mexicano, where the $10 Ultimate nachos come with a heap of tortilla chips, black beans, sliced jalapeños, nacho cheese, sour cream, salsa, and chicken or beef.

If you want something sweet, forgo the ubiquitous Ben & Jerry's stands (and their $7 sundaes) and search out Brooklyn’s Blue Marble organic-ice-cream booth on the ground level just inside Louis Armstrong Stadium. Flavors include mint chip, cinnamon, and culture (a hard-serve frozen yogurt that you might want to taste before ordering). Sizes come as single ($5.50) or double ($7.50); Marbles (a "tennis-ball size" scoop), as well as smaller Mini Marbles, also available in single ($4) or double ($6) portions.

If you’re hunting for an inexpensive bag in which to stow your freebies and extra clothing, bypass the Lacoste Retro Sport duffels ($85 to $105) for a roomy ecotote ($5) available at all U.S. Open stands, printed with an image of the stadium from the Opening Night fireworks ceremony.

While Lacoste’s classic New York Tennis 2009 tees are $35, and the U.S. Open's range from $26 to $45, Nike's are a relative bargain at $22. Nike's tout more varied styles, too, like versions printed with “Love Rafa” or “Love Roger” beside a swoosh.

If you're willing to spend money to save money, present $100 worth of AmEx receipts from the tennis center and receive a $50 gift card for Ralph Lauren (to be spent between September 14 and September 24) and 20 percent off at USOpen.org between September 11 and September 25. (Some restrictions may apply.) Or, at the New York Times booth, subscribe to the paper at a discounted rate and receive a $25 U.S. Open gift card.

If you forget your camera, you can borrow an Olympus Stylus Tough camera free of charge at the Olympus tent on the South Plaza. When you’re done snapping photos, return the camera and they'll transfer your shots onto a complimentary CD. Enter your favorite for a chance to win a camera to take home.