You can also buy an assortment of cheaper candies or gum and package them in sandwich bags. Seal with a Halloween sticker. You can hand out apples, popcorn, homemade cookies, etc. Be aware, however, that some parents are nervous about that sort of thing and might just throw the stuff out when their kids bring it home. If you are the organized type and see these over the course of the year pick them up and save in a box for Halloween.
Kids also love stickers.
Use your imagination and keep an open mind about what qualifies as a treat. Inflate a round balloon or beachball. Put an old white sheet or tablecloth over it. Tie a piece of string below the balloon or ball. Hang from your porch or a tree in your yard.