Are there any jobs in said places? If so, how do they pay? I’m sure there are homes that are under 100K, but they are likely completely removed from any metropolitan area, and thus any big job market.
Yes, inexpensive homes are not in plain sight of the metropolis. They are in low crime, low tax areas, and you don’t need much of a job to pay a $100/month mortgage and property taxes of $300/year...but it can get pretty boring, not having a real job. ;)