A normal island cart on the market may cost from $200 to $1,000, depending on the size and materials used. Islands with electrical power but no plumbing or cooking equipment often cost more than $2,000. Custom islands with power and water start at about $3,000 but usually cost a bit more. When eating space, cooking appliances, ventilation, and cabinetry are included, a full kitchen island set is above $20,000.