The discount varies. I think that 10%, 15%, and 20% are typical. Here's an example of a partnership that gives 20% off and that also includes enrollment at the Corporate Preferred Level:
https://www.spgpromos.com/gpsp/spgen...anding_id=U2UP

Lots of colleges and universities have such partnerships, and alumni are often eligible, too. At least in some cases, an alumni association may have a different SET code from the university's regular SET code.

Correction to their marketing wording...
"Your benefits will might provide significant savings..."