we shipped cars there couple of years back for around 120 bucks-
when i sell cars outer island lately it has been around 150-175(one way)
i'm scared to see what the increase is now- a couple of weeks ago i posted rate increses statewide-->here
the crappy part is they evaluate your car, and then give you a price for the shipping- a good tip is to have some paperwork with the weight of the car on hand... because if you don't they will use the weight listed on the door... and that is always heavier!
as far as the time.. if you ship out on wed(drop off at pier) it usually takes a day. if you drop off on fridays i think it arrives on mon morning.
*oh, and there are special rates if you bring the car back to original island within 30 days*
aloha from the summit of *-^-Mauna Kea-^-*