Costs will be more than the online price…the rule of thumb I used is to double the price of car for shipping and then double that total for PNG taxes and other fees:
When I purchased my car (2010) this was the formula I used for importing and it was fairly accurate:
CIF x 1.6 (60% excise duty for vehicles with engines under 2700cc) + 10% gst on the CIF + Excise Duty + custom clearance of ~1500 to 2000 kina.
Insurance and registration fees were several thousand more Kina. Insurance is required in PNG, but personal insurance is not. I purchased that through Tower Insurance (also where I purchased health and covered personal valuables). Registration can be done by a secondary party, if you get tired of waiting in lines and doing things 2 or 3 times then I’d recommend this. I did mine with Complete Auto located out at Malahang Industrial Park.
Fuel is k3+ / liter for Petrol. Most people prefer Diesel in PNG because it’s cheaper (therefore Diesel vehicles tend to have a higher initial cost).