With the long lines at the TKTS booth in Times Square, it's pretty easy to spot that discount opportunity. (By the way, no matter how long that line looks, your wait time is 30 to 40 minutes. A small price to save 45 percent or so on a couple of Broadway tickets.) But there are less obvious discounts at most Broadway theater box offices.

The list of box office discounts includes $25 lottery tickets to shows, less-than-$40 general rush tickets, student rush tickets and standing room only tickets.

Not every show has them, The Lion King for instance, is a roaring success and doesn't offer any discounts. But even mega-hits like Billy Elliot and Jersey Boys offer fans a way to get cheaper seats.

My list is updated with all the Broadway musicals now, and I'll have the plays updated soon. Check it out.