(Portland, OR) -- M&Ms are topping the list of Oregon's most popular Halloween candy this year. That's according to online sweets seller CandyStore.com, which uses order data from each region to determine the most popular candies. Reese's Cups came in second place, and candy corn ranked third. The National Retail Federation says Americans will spend about three-and-a-half-billion dollars on candy by the end of the month.