хотя про карту за 30$ не написано, что она пополняемая
за 10 точно
по третьему
Can more than one person use a SmarTrip® card for the same ride?
No, you cannot share a SmarTrip® card; each rider must have his or her own card. However, you do not need a SmarTrip® card to ride. There are other ways to pay your fare, and this can be done once you get to the station or board the bus; however, most non-SmarTrip® fare options have surcharges.
если покупать онлайн то вполне возможно, что в Россию доставки нет
по поводу покупки
Where can I buy a SmarTrip® card?
You can purchase SmarTrip® cards online, by mail, at select CVS/pharmacy, Giant Food and Safeway stores in the region that display the SmarTrip sign, Metro Sales Offices, SmarTrip® dispensers at Metrorail stations, and regional transit stores. Click here for a list of sales locations.
IMPORTANT: A SmarTrip® card or farecard must be purchased for each Metrorail rider. However, up to two children under age five may travel free with each fare paying adult.