What kind of coupon would you like to see?

In June I am doing a show at the Fulton Street Farmer's Market, where my Etsy Team will be featured. We are going to put together a coupon book for the first certain number of visitors. I would like to include one thing sale that is for the day, and another for an Etsy order. What coupon would you like to see? A percentage off the entire purchase? A certain dollar amount off of a certain item? Give me your input! I will probably put the same offer on here for my blog readers!!! Thanks for your help!