Your best bet, is the call the Grand in Tunica, MS (acutally it's in Robinsville), and ask for the poker room.
This casino tends to give very good poker room rates as a rule, and I'm sure they'll have a WSOP rate as well.
If not there, try Sams town, or the Gold Strike.
I'd call and make your room reservations now, because you can always cancel later, and this event tends to fill up pretty quickly when it comes to the rooms that is.
Link to the Grand:
https://www.harrahs.com/EventsDetail.do?...%20Event%202008