Bev, are you processing them in a hot water bath or pressure canner? That's how I do them, and they will last for at least a year. There are lots of canning sites on the web.
As well, you may want to check your local regulations about selling food items, even at a craft fair. I would think they would have to be made in licensed kitchen. You don't want anyone getting sick and sueing you. Good luck!
Practice safe lunch. Use a condiment.