I got Embassy Suites for 99 on the Sunday ngiht since my flight monday morning is at the aweful hour of 7am (YUK!)
Anna, I would write to Adam and see if they could give you GOLD status, based on the number of stays at Starwood (bet you are a Platinum or at least a gold.)
See what the stay requirements are and you might be able to meet them (you have the Hilton ORD there.)
Good luck.