I was just reading in USA Today that Home Depot is selling solar power systems made by British Petroleum. Here is the link. Here is the info on the system from BP:
The BP 3125 photovoltaic module is designed to provide superior value and performance for remote home, industrial, and residential use. With time-tested multicrystalline silicon solar cells and 125 watts of nominal maximum power, it provides cost-effective power for DC loads or, with an inverter, AC loads. With 36 enhanced-efficiency cells it charges 12V batteries (or multiples of 12V) efficiently in virtually any climate. Its unique IntegraBusTMtechnology provides added reliability through reliable outside bussing and by reducing diode and module temperature during module shading. The BP 3125 is used in remote systems for applications including telecommunications, pumping and irrigation, remote villages and homes, and land-based aids to navigation. It is also used in utility-grid supplemental systems for residences and commercial buildings.
Available versions include:
BP 3125U - Framed module with high capacity junction box
BP 3125S - Framed module with polarized cable connectors

The article says the cost is about 45K but with tax credits and incentives bringing the price down to 25K. Does anyone have any feedback about this system or know someone who has had it installed? I don't know alot about electrical characteristics so don't get a sense of how much power this would supply to an average home.
Solar installation costs tend to be regionalized.
In Marin County, the average cost of a solar system installation is approx. $9.29 per watt.
Its hard to say if this home depot price is competitive however additional competition added to the mix (especially from big box realtors) will frequently bring prices down in general.