Our company is looking to purchase a used geotechnical drill rig. We are located in Michigan, but we would certainly travel to look it over or pick it up.
1-(877)-365-1649
He is located ~50 miles straight west of Chicago. He has many years in the drilling industry. If he does not find what you need he can build it.
Also try David Jamison at Central-Star Drilling located in south central Ohio
This is an online site for a monthly drilling publication. There is a classified section with various drills for sale. You can open a pdf file of the latest edition.