I noticed this last time I was in Harbor Freight: https://www.harborfreight.com/100-watt-monocrystalline-solar-panel-57325.html https://www.harborfreight.com/1

I noticed this last time I was in Harbor Freight: https://www.harborfreight.com/100-watt-monocrystalline-solar-panel-57325.html https://www.harborfreight.com/100-watt-monocrystalline-solar... Not sure if these are much good, but the price seems reasonable for a retail-packaged solar panel. 18-ish volts is kind of an odd voltage to deal with perhaps, and it appears to not come with a battery charge controller like Harbor Freight's older more expensive solar panel kit. It's kind of weird that it's hard to buy solar panels as an individual person, so good for them for making it available. This is the only place I know of where you can just walk in and walk out with a cartload of panels; perhaps there are others?