How much does this cost to the nearest dollar?

Gable Mounted Solar Attic Fan - 65 Watts - 3350 sq. ft.
The Solar Attic Fan is a simple and environmentally sensible solution that can save you money. Powered completely by free solar energy, this sleek and efficient vent is both compact and quiet. It installs easily, with no electrical wiring, no expensive electrician and city permits. A single 65 watt unit can fully vent up to 3350 square feet, operating at up to 2105 cfm. Place it wherever you need improved circulation; attics, lofts, workshops, storage sheds, garages, even barns. Lifetime Manufacturer's Warranty on fan motor, housing and solar panel. made in USA. The Solar Attic Fan is a simple and environmentally sensible solution that can save you money.

Price is $644.00
Price: $643.7