$209 before and $249 after with the M12 code applied.

I just tried another booking for 9/6 to 9/7 with the M12 code. I see both the "best available" and a "Special Summer 2015" rate.

For the same room class, the "Special Summer 2015" is $40 more than "best available" so with the $50 daily credit, you gain $10 on the trip if you plan to spend it at the hotel. I find it strange they would have two rates like this listed.