An Invisible Paint Brush is one of the least expensive brushes in Neopia, except for the basic colored ones. They normally cost about 85,000NP from the shop wizard. They are not very sought after as, like the title suggests, it turns your pet invisible. http://images.neopets.com/items/invisiblepntbrsh.gif Here is a picture of one. Good luck seeing it! There is also a http://images.neopets.com/items/petpetbrush_invisible.gif Invisible PetPet Paint Brush, which looks surprisingly similar!