HELP! I'm attending a potluck. What is a nice dish/tray i can 'buy'?

I don't know how to cook and don't have much time. I WANT to buy my food. :) This is an mid-age range crowd for the potluck. I don't mind spending up to $35 bucks to get something nice. Some are already brining salads, desserts, fruits, sodas/drinks, so you can knock those ideas out.