What are the tools for sending letters by mail to business owners?

July 01, 2024
by a searcher from California State Polytechnic University - Pomona in Los Angeles, CA, USA
I want to send letters to business owners to see if they are willing to sell. I have the business address. What are the tools for sending letters by mail to business owners?
from University of Utah in Salt Lake City, UT, USA
Go Big Printing does this yet again hundreds of companies out there.
https://www.gobigprinting.com/
from The University of Hull in Hull, UK