We used a company named Pasha Hawaii (https://www.pashahawaii.com ) to ship both our cars and had a good experience for about $1,100 per car. But there are plenty of other companies that also provide the same service if you want to shop around and get several prices.
Transport time was about three weeks, so we sent one car early in order that it would be in Hilo when we arrived there permanently. The nearest drop-off point to us was Hayward, California near Oakland. Pasha Hawaii has pick up points all along the western coast. If you are inland you may need an auto transporter firm to get your car port side.
We kept our second car as long as possible, but since the shipping date was Tuesday and we were leaving the following Monday, we needed to rent a car for that one last six-day period.