Just got the following email offer from Disney:

Save 50% on Mary Poppins on Broadway

Buy One, Get One Free - 5 Days Only!
Must buy tickets by March 2, 2010

For select performances thru March 27, 2010

Three easy ways to get your discounted tickets:

1. ONLINE: Visit link and enter code BERTBG
2. BY PHONE: Call the Disney on Broadway Hotline at (866) 870-2717 and mention code BERTBG
3. IN PERSON: Bring a printout of this page to the New Amsterdam Theatre Box Office, Broadway & 42nd St.