Sometimes you can find coupon codes/discount codes for websites like Ticketmaster. Just type in the name of the website and “coupons” or “discounts” in Google and see what you find. One site I really like is retailmenot.com.

I also found a coupon code for $20 off at StubHub on http://www.slickdeals.net. I think it is about to expire but might be worth checking there every now and then for furture coupons at ticket sites.