It's on DVCMember.com. Click on the "Member Privileges" menu then "Member Perks."
However, it's important to note that the website isn't always current and the perks are subject to change at any time. I know that makes it hard to plan ADRs (if that's your goal), but that's the harsh reality of the situation.
At check-in you'll get a booklet called Portable Perks which is supposed to be the bible on current DVC perks. that's about the only thing you can really count on (and carry with you to prove you're entitled to a discount.)
If you will be spending any amount of money on Table Service meals AND will have an Annual pass in your group, consider the Tables in Wonderland card. It costs $75 but it entitles you to 20% off at most table service restaurants throughout WDW for a full year. Alcoholic beverages are INCLUDED in the discount and the discount is good for up to 10 people on a single check. And since it's good for a year, many people get multiple trips on the same discount card.