[BeefySwain]

Seems like this company ships in Arkansas only.

What should I be searching for to find these generally?

[phyzix5761]

Home kits/house kits

[worstspotgain]

Another inexpensive option (depending on location) is a factory-built house. These can be built in warehouses in "slices" narrow enough to fit on a trailer. Some of them are also on the designer side, e.g. https://www.plantprefab.com.