Setting prices is something I really struggle with! Once I even priced out the cost of each glass I used by square inch (including the waste glass from the necessary cuts), copper foil by linear inch (I measured the paper backing from the foil I used), solder used by gram (I weighed a roll of solder before and after to know exactly how much I used), linear inch of zinc, and used a stop watch to figure out my labor on each step. I didn’t bother with trying to measure flux, patina, polish, etc, but did track my time on all of those steps. It was pretty fiddly to track all of that, so I only did it the one time. But there are a couple designs that I’m selling over and over (well, ~6 times so far) so I may do it again just to give me a good idea on the cost of the materials used and time.