There are two ways to purchase G Suite Enterprise for Education - Full domain (purchase a license for all staff members and get free licenses for students) or partial domain (purchase a minimum of 15% staff licenses - or 50 staff whichever is greater - and benefits only apply to those with the license applied). I've attached a document that compares the features available for a full-domain license vs. a partial domain license. Full domain pricing is $24/license. Partial domain pricing is $48/license.
Approval of Teaching Applications for School Use.
E-Rate Funding Late? ETA?
Windows Licensing - What is needed to Image Windows 10 workstations.