1 acre lots are a little tough to come by here. "Normal" lots, app. 1/4 acre are selling for $30,000-$40,000 depending on where it is. These would come with city water, sewer, electric, phone, gas, etc.
My wife and I just looked at a 6.5 acre parcel in the county. Its a "view" lot, it has power, gas, irrigation, etc but would need a domestic well drilled and a septic tank. They are asking $115,000. They may get that but not from me. Other, less desirable lots in the same subdivision (near interstate) just under 5 acres are listed at $89,000 and this includes the well.
If you want to live 15-35 miles from town, you can pickup 40 acres of land from $16,000-$40,000 if its not irrigated or adjacent to public lands. Irrigated cropland runs $2500-$4500 per acre and most places have a 40 acre minimum for housing. Sometimes you can get away with 5 acres, just depends on where you are.
This is info from SE Idaho, specifically around Pocatello.