There are no places that don't have cheaper region but one just have to be careful before moving to one because most of these places are most often than not ridden with High crime rate, low social amenities, high level of unemployment and maybe extremely heat. But then it also had it's benefits of low cost houses, less people which takes away overpopulation, cheap lifestyle and way of living.
In California places that are cheap are
Oxnard with population of about 207,000 people, rent per month is $1675.
Redlands is another cheap place with about 71000 people and rent monthly is $1226.
Chisco is also cheap .it's has about 92 000 population and a monthly rent for a one bedroom for $842 and the median income is about $43,000