Much of the festival can be enjoyed simply for the price of Epcot admission. There are some 20 or so food booths placed around World Showcase that offer sample sized food, wine, beer, etc. for a small price -- $3 to $4 per sample. There are also numerous wine seminars you can attend for no additional charge.
There are also wine pairings at various restaurants for perhaps $35 per person. Those need to be booked by calling 407-WDW-FEST. There are other events as well (dinners, etc.) at various prices. You can get a list at the home page of this site. In particular, many enjoy the Party for the Senses -- about $90 per person for a cocktail party with lots of wonderful food and drink to be tasted and enjoyed.
The festival is great fun!