One line of the bill differs from the plain colours: 50 metal fragments instead of 25. That is a handful of ore in the furnace, so the extra cost hardly registers. The sulfur stays the same, all of it inside the gun powder, and powder is still the part that empties a box.
So the question is whether you need the drawing. If one colour will do, the plain Blue Boomer costs the same powder with half the fragments. For a clan tag or a message over the roof, this is the only boomer that does it, and how the editor works is on the item page.
As with the rest of the set, owning the item is the unlock: nothing to research, no bench for the shell.
