Go directly to the theater's box office when it opens (usually 10 AM) to buy "rush" tickets for around $40–$50 on a first-come, first-served basis.
If you're a student, teacher, or union member, a TDF membership ($42/year) gives you access to deeply discounted Broadway tickets in advance. Quick Comparison Table where to buy discount broadway tickets
These sites often list discount codes you can use online or mention at the box office to waive high third-party fees. Go directly to the theater's box office when
Pro Tip: The Lincoln Center booth is indoors and typically has shorter lines than Times Square. first-served basis. If you're a student