I would call Villages Golf Cars at Colony and ask if they'll match the price of the golf cart dealer on O'Dell.
I would go to this Sumter County Code Complaint website and list them as a roadside vendor in a residential neighborhood. They wouldn't be able to investigate in time, but upload a photo of the current situation and they probably would stop them from any future operations.
Submit a Code Complaint | Sumter County, FL - Official Website
Call TV Deed Compliance office and report the violation and send an email with attached photo to
deedcompliance@districtgov.org