My friend passed on info on the discount (pretty much free) club he is in.
Note if you do book shows and cancel you have to pay a fee. Otherwise the shows are really free. Usually they are the small shows downtown or in other venues.
1- Website is www.houseseats.com
2- Price of $89/year includes 1 or 2 free seats per show
3- They are currently running a limited time promotion giving you TWO years for $89.
4- Tickets become available 1-4 days before performance date