Hey mobilehobo, did you happen to go to UCR's recruitment day? I'm also heading there this fall (Plant Biology) and during all the meet-and-greets and made some contacts with current grad students. Basically I asked around about places to live and immediatly found a sublet (I'm actually starting in July, so I needed a place early). All the other students were extra kind, so if you have any contacts down there I would just ask around. From what I understand rent is pretty cheap (though I am from the Bay Area) and it's DEFINITELY better not to have campus housing.
Good Luck!