One of my favorite Jackolantern styles is to use the inside of the pumpkin in the Jackolantern. Once you have stenciled the pumpkin, take some of the insides and spread them around to add to the gore.
Party supply stores would carry them. Online, there are free stencil downloads on marthastewart.com that you print off yourself, and packaged stencils for sale on amazon.com.
Patterned stencils really vary in price from how elaborate they are. You could try eBay if you are looking to get it cheap but try Michael's when they are on sale.
Craft stores and department stores carry these items during the holiday season. Shop around in those stores first. If you can't find the stencils, try ordering them online.
you can make t-shirts!!!! take a plain white tee and spray paint it with red and blue have usa stencils and star stencils it works out great and u look great and ready for the 4th!! so i recommend this to all families to try!! trust me your kids and even you will love it! and you will have fun making it tooo
You can try online at places like Zazzle you you can make your own. Just get some spray paint and make stencils and spray the logos on.
There are a lot of great sites where you will be able to buy paint stencils so that you can be ready for your art class. Make sure that you check out http://www.hobbylobby.com or try out http://www.stencil-library.com and see what great products you can find.
Try claus.com
try kidshealth.com
when you need to run have some fun get some zinc and remember try have some fun
You can find downloadable celebrity stencils for your pumpkin at http://www.pumpkinglow.com/Patterns3.htm. You can also try http://www.huliq.com/10178/tmz-has-free-celebrity-stencil-pumpkin-carving-ideas
try dressupgirl.net
to have fun .... maybe you should try some....