The normal Act 2's are $150; 10-man SNG that you have to win in order to get into an Act 3 (2nd and 3rd get to play another Act 2 for free). I think the better bet is the Act 3 super satellite, which are $100 and hand out as many Act 3 coupons as possible depending on the prize pool. There is an optional $50 add-on, but it's only during the first level of play. It's fairly easy to get into an Act 3 this way. The only thing is it doesn't look like they run those on Saturdays.
http://www.foxwoods.com/OurWonders/G.../WPF/Acts.aspx