Cost for buying a new OPC?

For Off-peak car, you will get an upfront rebate of $17,000 to be offset against the following items:
(a) COE Quota Premium
(b) Additional Registration Fee (ARF)
The rebate is first offset against the COE premium payable. Any excess is then offset against the ARF payable.

Plus, a flat discount of $800 on annual road tax, subject to a minimum road tax payment of $50 per year.

Monthly instalment is depend on how much loan you take and the repayment period. For example, if you take 100% loan for S$20k with interest of 3.25% p.a. for 8 years, the calculation will bb as follow:

Total interest for 8 years = 20000 * 3.25% * 8 = 5200
Monthly instalment = 25200 / 96 = S$262.50

Here's a link on ebay Map-it where you can find them in your home town