Small/medium sized signage related stuff. For me, since I was low volume, a BOM rule of thumb wasn't super useful, as things like shipping from the manufacture

Small/medium sized signage related stuff. For me, since I was low volume, a BOM rule of thumb wasn't super useful, as things like shipping from the manufacturer, breakage, reliability, etc, were just as big a driver and varied by product. BOM mattered more for small/light things, but I did variety in small quantities, so I don't have any useful rules of thumb. One thing notable that I didn't predict well was competitors that would sprout up selling for way too low. They wouldn't last long, eventually disappearing, but hard to compete with that.