When I got on the rush line today (Saturday) a little after 10am (didn't have much choice given the timing of my intercity train), I must have been around 50th in line. Needless to say, I didn't get a rush ticket and ended up getting a ticket via StubHub. Perhaps because of MLK Jr. weekend, my Saturday matinee ticket came out to $44 before fees ($56 after fees) for Row F Seat 8 (house right rear mezz), which was about the cheapest the tickets went. This past week, I saw weekday tickets go as low as $18 before fees; surprisingly, last night's show (Friday) got down to $25 before fees, perhaps because of the rain. Someone even reported, on another thread, that tickets plummeted to $10 before fees for the 01/03 matinee. However, as Danielle49 mentioned, ticket prices are, indeed, generally hovering around $30-$35 before fees about an hour before showtime (especially on weekends).
For those considering StubHub, be sure to also look at TickPick. Sometimes TickPick is a couple of dollars cheaper for the same seat.