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Sadly, compared with 30 years ago, when I last bought one, prices have shot up. Here is a site with a complete system - 50W turbine, mast, battery, controller & inverter. If you use 12V LED lights, you would not need an inverter and you could have far more lights as their power consumption is a fraction of other lighting systems. Price is £840 for the full kit.
Alternatively, there are vertical axis turbines of similar power - in some situations, they may be the better option but tend to be more pricey - around £500 just for the turbine, without any of the other components, including the all important battery!