Do you want cheap solar charges for AA batteries? They are available all over at reasonable prices. I am talking about the outdoor yard lights that you see all over town. They consist of photovoltaic cells that convert sunlight into direct current. Each has one rechargeable AA battery inside it. These batteries can easily be removed and used to power flashlights and other devices.
The light can be used as a solar charger to keep your batteries charged or they can be used as night-lights. The actual lights are not particularly bright. I would not count on these as a good light source for normal uses. But as night-lights for kid’s rooms or to find your way to the toilet they would work fine.
They could also be used as markers for trails or paths. There uses are only limited by your imagination