How much can I sell 1 cotton candy for?

Well this really depends on your market, however you should look at it like this, it cost you 10 cent to make, so if you sold it at only $1, that still 90 cents profit every sale!
We would recommend selling at $2-$3, given the extra value the customer receives from this machine in the experience of watching the cotton candy been freshly made in front of their own eyes, warm and not sticky, they will be cueing up, trust me!