For those looking to purchase New York City Metrocards on eBay; When determining your maximum bid be sure to consider the 20% bonus given on all Metrocards purchases at the platform vending machines. 83.34% of the face value of the Metrocard, less shipping cost, would be your breakeven if you were to purchase the same card in person. Recently I have seen too many cards selling for a premium (or too little of a discount) which does not make sense.