The lesson here is that home cooking is inexpensive! We bought most of the items at sale prices, but even at regular prices--double or triple for some things--this would still be a reasonably priced meal.
We were told to expect between 7 and 20 and the actual number was about at the half-way point. We ended up using less food than we brought, because the kitchen we used was not well-equipped. We only had two medium skillets and one medium saucepan. Everyone had at least one large helping, but some of the hungry people ended up being sated by the brownies and ice cream we had for dessert.
Rice with Thai broth (Big Lots!): $1.50
Shrimp ($2.50/lb), coconut milk ($1.00), curry paste ($1.50): $5.00
Veggies roasted at home, zucchini, eggplant, peppers, onion,reduced for quick sale:$2.00
Braised greens (garden) topped with tofu: $2.50
Peanut sauce: maybe $2.00??
Salad blend bought at Sam's Club: $3.00
Ice Cream: $4.00
Brownies baked at home: $2.00
WHAT? Under $25.00????
Add a few cheap bottles of wine . . .