US Toy is similar to Oriental Trading Company. I'm lucky enough to have one of their stores here in town and I'm over there quite frequently in the fall. Tons of carnival items, teacher supplies and their own magic shop. They also carry some smaller lighting like strobes and blacklights. Good prices, better if you buy in quantity. Not top notch quality but perfect for dark nights with minimal costs.
US Toy also has a costume department and they sell everything from the discount stuff to the higher quality items.
They are different parts of the same company and you can navigate over to the other from each site by clicking on the links at the bottom of the page. Constructive Playthings has more of the educational stuff.
www.ustoy.com
www.constructiveplaythings.com