I get it cost really worried me too when I was deciding where to go. Overall there were other reasons that for me out weighed the added cost in rent.
I say just keep looking the prices here fluctuate a lot and getting a roommate can definitely help with the cost. I currently live at Parker Flats which is really nice and within walking distance to restaurants, the park, the grocery store, etc. and has great walking trails right behind it. It's about 15 mins to campus with traffic. Some other popular places that my classmates currently live at and like are Park Sixty Four which is also in downtown Parker, Broadstone Montane (can be very expensive), Ranchstone (pricing depends on when you look), and Courtney Downs. You can also call and ask if they have any specials for RVU students and most places will waive the application fees and deposits.
I am not sure if you are from Colorado but the other thing I will suggest is if you look anywhere outside of the Parker area just be aware that I-25 is a nightmare during rush hour and E-470 is an expensive toll road.