From tickets, flowers, and pictures to limo rental, food, and after-parties, average spending for prom night was estimated at nearly $1,000 last year, according to a Visa survey. The lion's share of the cost, not surprisingly, is allocated to attire. For girls determined to have a red carpet moment, the price tag could easily hit $400. Guys don't get off cheaply either -- tuxedo rentals commonly run $170 to $200 for a basic get-up. But a little savvy, some ingenuity, and a few discounts can keep the cost of prom attire well below $150.