It doesn’t have to be expensive to go see an excellent play at an excellent theatre. The Woolly Mammoth Theatre Company, called "Washington's Most Daring Theatre" by the New York Times, offers the best deals you can get anywhere because you pay what you can.
This offer is for the first two performances of every main stage subscription series production. Those performances are usually on a Monday or a Tuesday and can be bought an hour and a half before showtime. Performances for this year include: Boom, Antebellum, and Fever Dream.
Info on the plays and show times are available online, go to: http://www.woollymammoth.net/index.php
There's a two per person limit so take someone special with you.