University of Miami is tax exempt and many purchases made by departments can be made without having to pay sales tax.
Instructions for how to do this are on the Controller’s web site

At the current time the University enjoys sales tax exemption in the following states and jurisdictions:

Connecticut
District of Columbia          
Florida
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Maine
Massachusetts            
Michigan
Minnesota
Mississippi
Missouri
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Pennsylvania
Tennessee
Texas
Utah
Vermont
Virginia
Wisconsin