In the past 7 years, we have been able to get 2 cheap day of game seats in the 400 section, then bribe the usher where we used to sit behind the visitor's dugout. We probably saved $40. But this scheme is likely to end after this past season.
Another factor here is the overall cost for a family to come to Nats Park. Besides tickets, the concession prices are getting tough for a stereotypical family of 4.