A Phoenix cards rep will usually pay to take a table. I have also seen lots of people selling nappy cakes (I think they are called), but I don't know the name of the company.
Our one gives stalls to various charities, usually local, and they are each allocated a stall for which they provide the goods. Things like second hand book and toy stalls, bric a brac etc. Each charity asks for donations of all goods from its supporters, and they are shared out appropriately on the day.
A fortune teller always sold out within, literally, minutes at DD's primary school fair.
Different sorts of tombola, such as bottle tombola, chocolate tombola, jam jar tombola (jam jars filled with sweets, small toys, beads etc). You might be able to ask local primary schools if their pupils could donate the jam jars. I have also seen a fruit tombola, where the prizes were baskets of fruit, wrapped in coloured cellophane and ribbon. They looked lovely!
Fire brigade might provide a fire engine and a couple of firemen for the littlies to explore.