Rough ranges, and every one of these varies by vendor and by county, so confirm current pricing directly.
Parcel data. Many county GIS and assessor sites let you pull owner names and mailing addresses for free, county by county, which is slow and costs nothing. Commercial parcel data platforms that let you filter by acreage, owner mailing state and assessed value tend to run somewhere from about $100 to $500 a month, sometimes with per-export limits.
Skip tracing, which means finding a current phone or address for an owner whose mail bounces, is usually priced per record and often lands in the range of ten to forty cents in bulk.
Mail. A printed letter or postcard through a mail house, including printing and postage, commonly runs somewhere around fifty cents to a dollar per piece depending on format and volume. So 2,000 letters is a low four figure spend, not a small test.
Closing on a rural parcel. A title search alone is often a couple hundred dollars. A full closing with title insurance through a company that handles land is frequently in the several hundred to low four figures range. A boundary survey is a separate item and can easily be $1,000 to $3,000 or more on acreage with rough terrain.
One thing that shapes your whole list-building step: about a dozen states don't make sale prices public at all. In those, you can't build comps from recorded sales and end up relying on listing and sold data from agents or land platforms. Find out which kind of state you're mailing into before you budget for data.
