Yes DVC members (and those who have an AP/PAP) can get a discount on MNSSHP tickets - on selected nights only. Copied some info for you from www.wdwinfo.com
2007 TICKET PRICES:
All ticket holders for this event will be required to wear a wrist band.
**ADVANCE PURCHASE - Tax Included
Adults: $41.49 - ages 10 and up
Child: $35.10 - ages 3 - 9
I ordered tix last year (wasn't a discount day) and received them via us mail.
I checked the weather and found it was supposed to pour buckets the day we booked, took the tix to guest services @ Epcot when we arrived and were able to exchange them for later in the week.
When we are in Disney for the upcoming trip we are going to pick up our tickets for MNSSHP. I am not going to pre-order on line as we will be right there.
If I can only not loose them over the next 4 months!