At Walmart I found a super deal with 350 pieces of Hershey candy for $24.01. This breaks down to about a nickle per piece of candy.
If you are looking for a smaller amount of candy bars, they also have 95 pieces of Hershey Candy in a smaller variety for $9.94. This breaks down to around a dime per candy bar.
At KMart they have similar packages which range in price from $9.99 for 100 pieces of Hershey candy.
to 240 pieces of candy for $14.99. This breaks down to be an average of a dime per candy for either deal.
Now Target is running the same candy bars in a variety of Wrigley's candies to the bag for 130 pieces at $7.99.
I don't think you can get your candy for much less than that.
I sometimes give out potato chips that I buy in a case of 42 bags. This year the price varies from $5.62 at a local restaurant supplier to $6.36 at Sam's Club. In years past I have purchased this case for $5.00 from our neighborhood Cogo's but this year they don't have the cases and are selling Halloween prepared packages with less bag in them.