Islands in the Oceania region are more expensive at $18,537 on average per acre, while they are $23,516 on average per acre in North America. Europe ranks as the second most expensive continent to purchase a private island, with the average cost per acre over $68,000.

Some islands can be bought undeveloped, while others already have roads and/or houses. Islands are also available for rent. Many celebrities have their own private islands. Commercial development of uninhabited islands can raise ecological concerns, as many have a fragile environment.

Krolow rarely spends time on his own islands because they are fully booked up a year in advance, with the exception of a small island on Georgian Bay that he's bought for himself and his family and says is his “little haven”.

You can find private islands for sale via Private Islands Inc. or Vladi Private Islands, or by contacting a realtor who specializes in big-ticket sales. Additionally, some high-end real estate companies, like Sotheby's International Realty or Christie's International Real Estate, list private islands for sale.