Unfortunately, there are no discount promotions for the CCNP R&S exams at this time. However, Cisco may offer promotions from time to time that target different audiences and have differing rules and time limits.
If you would like to qualify and receive notifications about future promotions, you can login to your Certifications Tracking System profile and click on Update Personal Info. On the Update Info page, you can select "Yes" to receiving emails about "Cisco training, certifications, services, special offerings, and events" then click Submit.
Best of luck on your certification goals!
Cisco Learning Network Moderator