Visited Batam & took the opportunity to look at the discounted vouchers that are available to Sporeans who want cheaper ferry tickets. You have to buy these cheaper vouchers in Batam. They are not available in Spore. So next time get a 1 way ticket from Spore & in Batam get one of these vouchers available at many money changers in Batam. I got mine from a money changer in Nagoya Hill Mall.
For Sporeans cheaper tixs are only available if you are using Wave Master(new name is Majestic) or Sindo ferry services & these 2 companies only serve the Spore to Batam Centre./Sekupang route. They do not go to the Harbour Bay port at Batu Ampar which is closer to Nagoya:(
Batam Fast does offer cheaper tickets to Harbour Bay but only for Indonesian passport holders & not Sporeans
Since Batam Centre is farther away from downtown Nagoya the taxi fare is higher.
The taxi ride from Nagoya to Harbour Bay ferry terminal is 50,000 rupiah.
The taxi ride from Nagoya to the Batam Centre ferry terminal is 80,000 rupiah.
A normal price of a 2 way ferry ticket from Spore to Harbour Bay & return costs SIN$48
If you have a voucher the cost is the following:
For Wavemaster(Majestic) a voucher costs 290,000 rupiah. Using a foreign exchange rate of 9,700 to the SIN $ that is SIN$29.90. There is the added cost of a higher cab ride of 30,000rupiah times two back & forth. So 60,000=SIN$6.18.
Total cost of using a voucher is 29.90 + 6.18 = SIN$36.08 VS $48
Up to you to decide if saving $11.92 is worth taking the extra effort
If you decide to take Sindo ferry services. The cost of the voucher is 160,000rupiah. Spore ferry tax is SIN$6, Batam ferry tax is 65,000 rupiah. I'll leave you to do the math.