Please note: These prices are only BASE prices. They will vary depending on the complexity, coloring type and amount of characters. Pieces with detailed characters and complex backgrounds will be more expensive. There are also different kinds of coloring styles. Flat colors are the cheapest and have no shading. There are also other kinds of coloring, like simple or complex.
Another note: some backgrounds are just simple blocks of color and will be cheaper than fully drawn and shaded backgrounds.