Does anyone know of an aggregating system for Marriott discount codes? The best example is Kayak.com: you put in your info and it performs the query on multiple sites and displays the best deals. I want this for Marriott discount codes.

I have to spend a few hours trying to figure out where to go every weekend based on hotel price (instead of flying me home, my client covers hotel and rental car on the weekends - win/win!). Instead of checking city by city, code by code, I want something that I can enter the dates and region (Mid-Atlantic US) and have the system find the best combination.

Thanks!