CSUCI does have rentals near the school. They are also controlled by the school and I doubt would rent to anyone other than a student, teacher, or employee of the school. The campus is not exactly next door to Camarillo, Oxnard, Thousand Oaks or Port Hueneme. If you are looking for a place near the campus that may not be an option for you. Rentals that are near the school rent for 3 to 4 times what you are looking to spend and as I stated are not for people not connected to the school in some way. I have seen room's in homes that rent for $700 and up.
Studio appartments in Oxnard are in the $1000 range. You may find something in Santa Paula but the cost will still exceed your budget.