I would also recommend checking the discount online sites such as priceline to see what deal you can get with them.

You can also get 10% off gift cards and airline miles on either Delta or USAirways. This would require that you purchase at least $1000 so you would need to be able to use that amount to be worth the entire 10% off. But anything charged to the room could be paid by the gift card. The links are below. Using a Marriott credit card for the purchase would also get you 5pts/$.

https://www.marriottvacationcardoffer.com/delta

https://www.marriottvacationcardoffer.com/usairways