You can buy two for one tickets to Off-Broadway shows during Off-Broadway Week.
-PJ Gach
   Courtesy of Puffs
Off-Broadway Week kicks off in New York City from February 12 through the 25th. And during this event, you can purchase 2-for-1 tickets to shows. There's everything from children/family fare like Blue Man Group,  Stomp,  Addy & Uno, Cinderella, the Musical  to musicals like Red Roses, Green Gold, Avenue Q, This One's for the Girls, to dramas like [Porto],  Perfect Crime, Balls, and more.

Tickets start at $40 and go up. During Off Broadway Week, you'd be able to purchase two tickes for the price of one. So two seats, at say $57 each, would normally go for...let me do the math here....$114 (not including taxes etc), during Off Broadway Week, you'd pay $57 for both tickets. Gotta love a deal!

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To view all the shows that you can see during Off-Broadway Week, visit NYC GO: NYC Offical Guide. They also have a summary of each show, and suggested age groups. While on that site, you'll pick up your promo code, so you can get your two-for-one theater seat deal.