Stubhub anyone?

Used them quite a few times, very efficient and reliable but remember the prices are OUTRAGEOUS and stub hub gets a percentage ... but if there is something you really want to see, and price is not an issue, go for it. You never deal directly with the seller so there is not an ebay type of issue and there is no auction either.
 
I used them once for sports tickets. The prices were pretty high, but it was convenient and they were very helpful. I'd definitely feel comfortable using them again if I needed to. You might want to see how the prices compare with other ticket brokers... one situation last year it was cheaper for me to go through a non-online agency than for what people were offering their stuff up on stubhub.