Subject: Prepaid toll cards
Prepaid toll cards (they are called VIACARD) are sold at tobacconists, post offices and some newsstands. Their value is 50,000 lire of 100,000 lire and you get no discount, you just don't have to pay cash at the toll booth. Lire 50,000 is sufficinet for one-way Milano to Florence, but be advised you can pay the toll with Amex, Visa, Mastercard and some ATM cards.