I stopped by the the Tix 4 Tonight location this morning looking for tickets to see David Copperfield.  I was informed they had tickets that were 3 rows from the back (2nd section) for 89.99 which they claimed was 40% off the normal retail price.  Before going to Tix 4 Tonight I had gone on MGM's website and to check prices and  tickets in the same section were selling for $79.99 and tickets for section 1, closer to the stage were selling for 109.99.  So either way their math does not add up.  Do yourself a favor, buy your tickets directly online.  This will save you a trip to their locations, save you time from waiting in line and more time when you have to exchange your voucher for the actual tickets at the box office.