From Travelzoo:

On behalf of our subscribers in Washington, D.C., we have negotiated this Travelzoo Local Deal:

$9 – NATIONALS GAMES ON LABOR DAY WEEKEND, HALF OFF
http://www.travelzoo.com/l/78541519-1089317/
Source: Washington Nationals

Spend Labor Day weekend watching the Washington Nationals for as much as 50% off. Don’t miss your chance to get to
Nationals Park before summer is over.

Catch games against the New York Mets, Sept. 2-4, or a holiday showdown on Sept. 5 versus the LA Dodgers, from the following seating levels:

• $9 (reg. $18) … Upper Infield Gallery
• $12 (reg. $22) … Scoreboard Pavilion
• $18 (reg. $30) … Outfield Reserved, including a $6 credit for food or merchandise
• $25 (reg. $46) … Left/Right Field Corner, including a $10 credit for food or merchandise

Check out a post-game concert by the band Lifehouse after the game against the Mets on Saturday, Sept. 3.