Thanks Baglady,
I do keep checking to see if there is any other rewards that become available, but i had a Hilton CSR tell me once that even if someone cancels a reward stay, it goes back into circulation as a non reward room. Don't know if its the same at Marriots. I will purchase 10K points, but i still need to get another 8000 within the month, and wont qualify for the credit card.