solar panels system

How can I get a solar panel system installed for my home?
I want to know where I can find a company that installs them for a reasonable price. I live in the northwest suburbs in the Chicago area in Illinois. Can anyone help?
Here’s the local solar energy association, which may be a good place to look:
http://www.illinoissolar.org/index.php?option=com_frontpage&Itemid=1
http://www.illinoissolar.org/index.php?option=com_bookmarks&Itemid=169
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