Cheapest option is by getting RUSH tickets. These are offered through a lottery system. Tickets are available the day of the performance, are normally about $30 each and cash only. Each theater/show has their own policy. Check out RUSH tickets information
Another option that is more expensive but still less than full price is TKTS. Three locations to buy tickets. I recommend Brooklyn location. There is never a line. Tickets through TKTS end up being about $50-75 a ticket. Check out TKTS info.
Another option that is more expensive but still less than full price is TKTS. Three locations to buy tickets. I recommend Brooklyn location. There is never a line. Tickets through TKTS end up being about $50-75 a ticket. Check out TKTS info.
To see what is playing go to http://www.broadway.com/