Actually, the moon style contacts are quite popular recently. Since Halloween is forthcoming before long. So, in order to achieve them, you can visit some large glasses market or better yet ,some online shopping sites. Vision works is good since they have got a wide range of contacts, in the mean time, their prices are not that bleeding. So, hope you can find what you really like over there.
You can go any shop who provide contact lenses. They probably provide moon contact lenses. If not, you can also search it online. There are many wonderful contact lenses online that are available to wear in Halloween party. Here are some websites where provide you such contact lenses: http://www.foureyez.com/crazy-contact-lenses/twilight-vampire-contact-lenses.html
When the halloween party is approaching, many people tend to buy the special colored contact lenses to match with their performed style. If you want to buy the new moon contacts, you could go to the amazon to have a look. The variety of goods there is complete. And the price there is suitable.