The dollar stores in your area are a great place to find wonderful non sweet treats for your trick or treaters. Some examples of those items and our favorites at home are:
Pens & Pencils
Halloween Rubber Duckies
Glow in the dark toys
We have also received on the pass some food items that seem to be a healthier alternative to candy such as:
Individual packs of pretzels
The night of Halloween at home we have a tradition. We called it the Halloween fairy. She comes at night and picks ups the candy and leaves a toy instead. That way if our son did get candy, the candy is gone by next morning, and there is less temptation for everyone and my son is happy with his new toy.