Patrick is correct, and I will add that there are many other factors as well, most importantly amenities and location. The least expensive land in Hawaii is on the Big Island and most likely in Kau, the southern tip district. Lots in Ocean View are primary on catchment water systems. Farther south to Na'alehu and Waiohinu you will find county water available. Also, there are a number of lots that are 'off grid" meaning no power at this time. That's not to say it wont' be available in the future, it just isn't ready now. Living on solar is quite commonplace in these parts and not considered a hardship at all, same goes for catchment water.
Also, one needs to consider that many lots are covered with lava with little to no vegetation and require machined site work before one can build. Heavy equipment operators are quite used to this and lava is easy to manipulate. Actually, in many cases, site work on a lava lot can be less cost prohibitive than some of the very steep more densely planted areas.
The farther you go from a populated town, such as Kona or Hilo, the less expensive lots and properties are going to be. HOVE is over an hour to town in either direction.
Then there are the Lava zones, too. HOVE is in a higher risk area and Na'alehu and Waiohinu are not. That being said, the views in Kau are some of the best on the island. It just depends on your priorities.
Good luck in your search!
Licensed in California & Hawaii