Octopus Card Set of 5 Hong Kong Transportation IC Card For sale: Adult: 4 cards Child: 1 card Purchased in Hong Kong this August and used for a few days. The cards are in very good condition. Each of the 5 cards has a balance of around 1 Hong Kong dollar remaining. They can also be used with a negative balance of 35 Hong Kong dollars. Just charge them and they're ready to use. This is the price for the set of 5.