I think I got the white chalk at Walmart but any good brand of white chalk will do. I would not use coloured chalk as the dyes in coloured chalk may not come out. The make up sharpener I got fr the make up big lip pencils you sharpen. I wonder if you could find a sharpener with the children's supplies for sharpening the big red HB pencils or maybe the hardware stores for sharpeners for construction pencil?