There was one booth located at Fashion Show Mall; get there about 20-30 minutes beforehand and get your butts in line - it can get quite ridiculous! Discounts are at least 20% off, so it's definitely better than paying full price! I got a ticket for Mystere for $83, with tax. Make sure you bring your $2 off coupon from their website for an extra discount! Shows are limited, and sections are specific; you also do have to make a run for it to the venue where your show is playing to get to your assigned seat (might be on the other side of the Strip!). Still, all this for the prices is worth it and it's a great place to check out for last-minute shows!
+discount tickets :D