What are the most frugal things that you bring to a pot luck?

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Last night I went to a pot luck. My friend had brought us leftover deserts from the Salvation Army, banana bread. I had gone to a place called "Souled-Out" which is a religious second hand clothing store that has old bread from Panera bread donated to them, so I took a loaf of bread from there. I had lentils and rice in the cabinet plus onions in the bin in the bottom and some veggie flavor cutes. So, 89 cents for lentils and only part of a package of rice, so about 50 cents for that. The flavor cubes were organic vegetarian low salt, so they were expensive, so that about another dollar in flavor cubes. The lentils, rice, and onions were a little over $2.00 (if I had cooked them in leftover veggie juice and/or meat juice, it would have been way cheaper). The other items were free. I've also brought pasta and sauce, each less than a dollar and fed a lot of people at a pot luck for less than two dollars. The only way I've done cheaper was for wild food pot lucks. White clover (picked for free) and rice with milk for about 35 cents and I fed a lot of people. It's better with butter and onions, the onions can come from my garden and only cost pennies, the butter has gone up in price, but a pat or two is still cheap. Chive flowers or whatever is ready from my garden can add more color and taste. If my wild berries were ever ready before a wild food pot luck, I could make a short cake with them or just bring a ton of them if we had a ton of them and that would be free. So what have you brought for cheap to a pot luck? What would you like to bring that would be cheap?