I don't know if this is also the case for Beauty Insiders.
Have you received yours in the mail? If so, is it only for VIB?
Update: If you are a VIB and still have not received the invitation in the mail, you can always use your email copy. If you haven't received either, visit http://community.sephora.com/t5/VIB/VIB-Holiday-20
For online purchases, VIB can enter code CELEBRATE to receive 20% off!