You can get leaf from any number of places. Michael's and Amazon (Mona Lisa brand) has it, Jerry's Artorama, Dick Blick. Coast Airbrush, The Gold Leaf Company, or any sign supplier. There are plenty more sources. The Mona Lisa sizing pen is not that great. Quality sizing, whether fast or slow, produces the best results and makes application easier. I've done quite a bit of leafing on carved signs, firetrucks and other vehicles. You'll most likely never use a whole book of leaf and can of size in your lifetime if just doing touchups.