OK, here's a weird one. I would like to make some treats a few weeks in advance to sell at a fundraiser. The fundraiser will be outdoors and it might get hot so, ideally, it would be good if the treats were not the kind that wilted under intense heat. Also, since the point is to raise money, it would be good if they were relatively inexpensive to make. Sweet, savory, beverage, whatever, I'm open to all kinds of ideas.
Any ideas? Tried and true recipes very welcome. And, oh, how much would you pay for a serving of said treat, whatever it may be?