Sara Bareilles has been raking it in and, if they were to release discount tickets for her limited engagement, they like would have done so a long while ago.
Expect to see more discounts for after June 13th, when Betsy Wolfe takes over and the box office drops off.
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According to my sporadic checking of the TKTS booth listings online, I've seen it at 40% off far more frequently than I had expected to with Sara taking over.
So far, it has not been on TKTS on any weekend since Sara took over. Just during the week. Wednesday seems to be the best day to find tickets.
That said, Sara missed a show this week due to illness. I don't think you can use what you saw in discounts for this week as representing the big picture.