See here.
The Advantage Solar Power System
$8142 without installation for 1.962 kW peak. It will produce about 250-300 kWh per month, depending on your location.
If I install it myself, and take the 30% tax credit, it is still $5699 to produce $28/mth of electricty. In other places, where the tax credits are higher and the price of electricity is higher, it might pay for itself. Not worth it to me.