Save some serious dough by using a Busch Gardens online promo code. I've scoured the web and found a few to share. They are open through April 7 daily for spring break. Use the coupon code that gets the best deal. Parking is $14 and if you're a VA resident, consider buying the season pass to maximize your savings throughout the summer.
Pampers: Pampers has a promo code out. Kids are free at Busch Gardens Williamsburg, VA by using code BGWPAMPERS at www.buschgardens.com/va. You'll receive one free admission for a child (age 3-9) on a single day admission ticket when you purchase a regularly priced adult ticket (These are about $70).
Wendy's: Use BGWwendys to get $20 off Busch Gardens single day admission ticket. (Appears to be expired as of 5/12/2013)
Food Lion: You can show your MVP card at the general admission window at the park (Either Busch Gardens or Water Country USA) to receive a discount of $14 off a child's (age 3-9) or adult's admission. Food Lion stores also have a coupon if you don't have an MVP card and are traveling from outside of the area.
Chick-fil-A: Chick-fil-A's in the Williamsburg area and certain areas in Virginia have coupons that can be brought to the ticketing to receive a discount, similarly to the Food Lion one described above.
For Virginia residents only: Have a preschooler aged 3-5? Get a free pass! You will have to prove their age with a birth certificate. The Sesame Forest of Fun pass includes unlimited park access at Busch Gardens and Water Country USA through September 2, but you have to complete the registration process by May 31. Go here to begin your registration.
Active duty/reservists: Be sure to check out their Hero Salute program where you can get free one-time admission that also includes up to 3 dependents. Go here to learn more and register.