Check here on Soaring Eagle's website for the "Gas and Gamble Package". It says good through March but when I called I was told through June. Also its only supposed to be good for Sunday through Thursday but was told that if they are not booked on the weekend it can be used also.
1 Room, First Class Accommodations
$50 per person in complimentary Premium Play to use in our exciting slot machines or at our table games
$25 per person dining credit to use in the Water Lily Restaurant, Siniikaung Steakhouse or the Firefly Buffet
$50 Shell gas card per room
A perfectly presented beer sampler for two including one bottle of Cow Catcher, one bottle of Golden Ale and one bottle of Raspberry Wheat
An etched pilsner glass filled with sampler munchies for each guest.
So basically a $50 room, normal rate is $136. Its limited to 2 people for the food/free play credits.