A one-day Passport costs $5.00 A three-day Passport costs $9.00 A seven-day Passport costs $18.00. Each Passport allows unlimited use of all subway lines, including surface Green Line branches, plus MBTA buses up to $1.70 fare (additional fare, if any, payable in cash), and commuter rail zones 1A and 1B - the same as a Combo Plus monthly pass. With the Passport you can also get discounts at some tourist attractions and restaurants. It is a good way to test-ride the T. Boston Passprts are sold at North Station, South Station, and Back Bay Station; at Airport, Government Center, Harvard Square, and Riverside MBTA stations; at visitor information centers on Boston Common, in Quincy Market, and at several hotels and newsstands.