THE BRONX - For Bronx senior citizens who don't live near a subway station, getting ahold of a MetroCard can be quite an ordeal. To make life a little easier, the MTA sends out a fleet of buses and vans to deliver the cards several times a month. Customers can buy and refill reduced fare cards, or buy E-ZPass On The Go tags. The MTA has been using the mobile sales centers since 1996.