This won’t answer your question - but might help you frame your own answer:
My personal default is 3x what it cost me to make, and I charge $50/hour for me time. So $20 sheet of material (I’ll charge for a half sheet if the item is tiny, but otherwise full sheet) + 1 hour to design and print = $210. It’s not cheap - but I’m not a bulk laser house, I make custom items.