Handmade popcorn at fairs

Looking for opinions on how much we should sell popcorn for at our local fairs to make a little extra money.. the red bag is a 1oz bag of popcorn(about a small at the movies). The yellow bags is extra large it’s 18” long and has about 4oz of popcorn. It will be made and bagged in front of customers.. Looking for ideas on what is a reasonable price to sell them for :) thanks!!