For another data point, we bought 19 kW of new panels from SignatureSolar for $6k shipped in the US not too long ago, so a bit more than 0.30/watt. Not top of the line efficiency at 20%, but high quality all-black monocrystalline Canadian Solar HiKu6 panels with thicker than normal glass.
Ironically, the little bits of metal to hold them to the ground cost almost as much, and the inverter and batteries both cost more.
Ironically, the little bits of metal to hold them to the ground cost almost as much, and the inverter and batteries both cost more.