When customers flock to your tasting room this coming festival weekend, whether they buy one bottle or one hundred, you'll want each customer to become an ambassador for your brand—and that means giving them information.
I usually recommend to clients that you craft a postcard handout. Postcards, unlike full size tasting sheets or newsletters, can be affixed to refrigerators and bulletin boards. And they're inexpensive to print—make the first side full color for impact, and the back in black-in-white to save money. With a supply of postcards on hand, you can save your more expensive print newsletters for customers who buy $50-$100 or more. If you have a spare laptop, set it up in the tasting room so visitors can subscribe to your blog and leave comments while they are there. (You might want to cover the keyboard with a plastic protector.)
Make sure you've got all the winery contact information on your cards, including your winery blog address and Facebook or other social media identities. Your goal is to get people to visit your website, subscribe to your blog, become your friend/fan on Facebook, and otherwise subscribe for future contact.