Just spoke with the Marriott. Their rack rate is the only rate they offer, at $249 a night. But after incessant pestering, they acknowledge that they have a contract with CCBill which, when it's signed, will offer a better rate (hopefully comparable to the Mission Palms.) I was advised to go ahead and make a reservation at the $249 rate, then call in next week and have it re-rated.

Just in case anyone skipped it because of the cost, thought I'd pass that along.