Research the prospective business schools that are being considered for application. Read each application requirements carefully; it may list the GMAT as an optional or unnecessary piece of the process.
Consider and research online degree programs, which usually do not require a standardized test for admission. Using a search engine online, search for "Online MBA Degrees" and look at the school's application requirements and program information.
Consider attending business school abroad. Many business schools outside the United States do not require the GMAT for admission. This unique experience may require additional requirements in place of the GMAT, however.