probably worth getting some nicer ones, as they go on much better and are probably more denser in colour. we use snazaroo, you can buy them at hobbycraft and you can also get palettes - they probably do a halloween one!
snazaroo are lovely, they do a really good job and they'll last you for all your future face painting needs. No doubt less likely to cause the slight rash that some kids get after having their face painted too.
Rather than painting the kids faces I thought I would do some halloween stencils to be like fake tattoos. I was thinking of a little pumpkin on the cheekbone using orange face paint and some orange glitter. I now know that snazaroo from the ELC are the best face paints but can anybody help me with the stencils and glitter?