How much would a 1x1 solar panel cost?

I'm doing a research project and i need to replace the battery of a toy McDonald's car. To find out the difference of the two, i need to know how much a 1x1 inch solar panel will cost.





I could only find 1x1 square feet of solar panel.

Thanks in advanceHow much would a 1x1 solar panel cost?
harbor freight.com

a 45 watt panel is around $50