Does your church have initials NHBC ? I did a stall there a couple of years back and barely made money back. It wasn't directly with church though was an All for Kids one, was maybe in October. Toys sold ok but was only after a dollar, people weren't interested in clothes really, people who did well were the handmade or designer from Europe stalls.

If you have a big item that will cover the stall fee can be worth it but otherwise I think have to sell too much to cover costs.

Carribean gardens (scoresby) have one that only costs 5 dollars and they take everything left to charity shops if you like. It is a Friday though.