Didn't I read that photovoltaic panels are in short supply?
Yes, Germany, Japan and now CA and NJ are sucking up all available supply. That should stimulate supply! The market still works for some things!
Take a look at http://www.solarbuzz.com/ for a chart showing retail prices of solar electric systems. The costs bottomed out about a year ago and have been climbing ever since, probably due to increased demand.

Bill Gross's Sunflower system from http://www.energyinnovations.com/ claims that it will undercut current prices by about 30%, but that's still going to be pretty expensive.

I considered adding a bunch of panels / batteries here a few years ago and guesstimated it would cost $20,000 at a minimum.  We have lots of sun so this area is considered "okay" but not "great."

I recall thinking "that's a car payment!"

Now, my electric bill, on a good month, is $200.  Perhaps it's time to check my math again...