In all, I think you'd do better just by going straight to the box office for the show you want to see. Tix 4 Tonight has some deals, but the seats I got for my show weren't very good (it's a gamble because you don't get to pick) and I had to wait in a very long line (half of the time in the hot sun) until I got to buy them.  They tack on a $5 fee for each ticket also, so it decreases any money you might be saving.  On a positive note, the people who work there are very friendly.