We did one, too. Made around $335. And I had priced stuff to sell.....50 cents, $1, $2, etc.
As I was putting out the stuff, it was heartbroken all the $$ spent on these items that we were selling so cheap. But, having done this before, I know that you have to price to sell. Another tip is make sure things are clean and work!
One woman came over and asked me to set stuff aside for her, so she could go get her money. She said "oh, you have nice stuff and all priced so well!"
Hope all goes well for you!!!