Here’s a great blog that offers free clip. With the Graphics Fairy you can even use the images to make a product that you intend to sell. They have tons of choices in every category imaginable. I’ve already downloaded some of them and they are beautiful to use on projects of all kinds.
http://www.graphicsfairy.blogspot.com/search/label/Halloween%20Clip%20Art

http://www.thefinickyfeline.com