TIX4TONIGHT has a site Grant, but you don't buy tickets from it...
www.tix4tonight.com
The nature of the tickets they offer will never allow them to sell
of a website. Many of the regular Show choices are there every day
and others are just up to luck and timing. Celine, Blue Man Group have
been there before...Mystere too I think but they show up late in the day
and you can never count on the 'A' shows to be apart of your choices.