If you are an MSDN Universal Subscriber you can save an additional $100 on the registration. To get the Microsoft rebate you need to register first then call 1-866-913-0430, or 514-913-0430 with your MSDN Universal ID. DevTeach will validate your ID with Microsoft and send you 100$. This rebate can only be used once by ID. This offer is retroactive to the 2004 registrations, if you have already done your registration, you can still receive the discount by calling.