I have struggled with this question myself. I have been researching solar power in the residential space for quite some time now. I have heard nothing but positive feedback about SunForce. Panels are available for purchase on Amazon.
Forgive my rant in advance. Most vendors are treating solar panel like appliances and not phones. Yes, a solar panel is similar to a water heater. However, it would be nice if you could walk into a store and pick up a couple of panels and install it the same day. I am sure there are people that have this experience, but I am sure that is not the norm. Right now you have to jump through a lot of hoops with buying solar. The options are limited and so is the information. I hope that helps.