First off, just to let you know, the Mondavi family/company pulled their sponsorship of the winery quite a while ago.
However, there is still 'special reserved seating for Disney's Electrical Parade and appetizers' (meats, cheeses, and bread) served at the Golden Vine Winery for $47 (adults) and $37 (little ones). The number is 714-781-4400.
Keep in mind that there are almost always front row seats back in the area between Golden Dreams and the Zephyr 30 minutes before show time. It's up to you what you want to spend obviously, but considering this is almost the price of park admission just to get apetizers and a nice seat for the parade....