Where is the Napa Valley Visitor Center for $ 20 wine tasting card?

Please let me know the address of Napa Visitor Center. I heard that you can spend $ 20 and buy a card to use it proves to do tastings at wineries in Napa 13-17. However, I have searched all over the internet, and I do not give a real address! Please someone knows the address please tell me. I can also acquire a second passport for proof in same place? Please let me know and I need the address for those who will be open on Saturdays.

COPIA: The American Center for Wine, Food & Arts 500 First Street Napa, CA 94 559 copies, a nonprofit wine and food discovery center in Napa, Wine Country is selling passports for only $ 10. This passport can be used both for tasting or two to a free tasting at wineries in Napa and Sonoma. Wineries include: Beringer, Clos du Val, Conn Creek, Costentino, Domaine Carneros, Louis Martini, Sequoia Grove, Luna, San Clemente, Castle, Gallo, Hanna, Landmark, Family & Larson. Get your passport in Copies or buy it online at the website Copies of http://www.copia.org/wine-country-passport: A passport is good for a couple.

Stryker Sonoma – Winery