There are some restaurants that give a small DVC discount on lunch during the week.
But, if you buy an AP (which many DVC members do), you can buy the Tables in Wonderland Card (TIW) and that will give you 20% off many meals. This isn't a DVC perk but one many take advantage of because they visit WDW enough to make an AP work.
Even though we visit WDW once per year right now, we still buy the AP and just go 51 weeks apart so we get two trips out of one pass.
You can add the dining plan to your points reservation.