http://www.segen.co.uk/solar/index.htm?gclid=CIPP7urXrZICFQ1I1AodFFDsRA
http://www.sunenergy.com.au/?gclid=CIO5wqHYrZICFQxaMAodjk9nLw
http://www.solartwin.com/installation.php?gclid=CPbWg8LYrZICFQSU1AodYRRKQQ
References :
They cost between $7 and $10 per watt, and can take anywhere from 15 to 70 years to pay for themselves, depending on how much you pay for electricity, how much sun you get, and what kind of incentives are available in your area. I put a link below to a web page showing all the available US incentives.
Most people pay an installer to set up their system. You’ll need solar panels, a roof mounting rack, wiring, and inverters (to make the power usable in your home.)
Good luck.
References :
http://www.findsolar.com/
http://www.dsireusa.org/