Im increasingly sceptical about these vertical wind turbines – someone please find me some real number with better prices

This could be the most powerful and efficient Vertical Axis Wind Turbine
Yet Another perfect wind turbine tested – vertical Savonius this time. Will it…

This one below may be interesting

This Could change Home Wind Energy Forever
How a Small Wind Turbine Revolutionize Wind Energy – The O-wind Turbine

231: A Closer Look at the O-wind Turbine