CompTIA offers special student pricing for certification exams for RMU students. 

Students can login directly to their website without any special code to take advantage of the discount pricing.  You just need to use your RMU email address when signing into the CompTIA site – this will verify you as an RMU student.  Student Purchasing: How-to

The current pricing (subject to change in the future) is provided in the attached document.  Current Pricing Guide