Out of broken reused solar cell pieces will help you to make your own solar panel with them. You can find them on internet or check out of somewhere to buy or find it.
Besides, you have some conductive copper mesh for make your own diy solar panels. You also know where to buy these kind of copper meshs, it’s available at many stores as you know. And the other hand, you should have sticks, a multimeter, glue gun and a conductive pen (or you can buy different kind of conductive as you wish).
And now with all these wherewithals, you could create your own diy solar panel and it’ll be more cheap.
You could have a little help on this video.
Good luck!