The most ambitious and expensive future project of floating city is planned to be build in very remote area of French Polynesia by 2020, estimated cost of just first pilot phase $167 M

Italian style and UFO alike round houseboat - cool design, but it is small inside with only one bedroom and not very practical and it could be very difficult and expensive to deliver it outside Italy because of its size - 40 feet wide and round shape

French design houseboats in Miami for sale, very nice design, but their prices $2.5M-$6.5M

Similar size houseboat based on steel hull without generator or solar panels to be used only as stationary dockside residence for sale - $1.5 M

Floating condominium with 165 apartments, their prices between $2M am $15M and their annual ownership cost is around 10% of it's price.

Yacht charters in Florida , check out their rates