$74.99 seems like a good price. However, this is at a time when the need for tungsten is down due to the evolution of the light bulb to LEDs. The question is how much tungsten is required for a solar panel? How much tungsten will be needed for, let’s say, a 30 acre solar cell farm? What will that cost? If I were a lawmaker giving out research grants, I would make sure all of the math was done to know the costs for the final product. I am sure the run-of-the-mill lawmaker is only thinking about how to line their pockets and not the practical matters of costs. They would sell their mothers down the river if it lined their pockets.
Typical solar cells are very, very thin. The frame is thick, but the actual cells, the blue areas, are thinner than your average window pane. The substrate is a fragile glass, and the actual 'cell' part is just a film on the glass. So any tungsten used would have to be very thin as well. Tungsten is heavy, just very slightly less heavy as gold................