The cheapest way to make a patio is to use materials that you already have on hand, such as bricks, gravel, or wood. You can also look for inexpensive materials at hardware stores, such as concrete pavers or flagstones. If you are up for a DIY project, you can also create a patio using recycled materials, such as pallets or old tires. Additionally, you can look for deals on patio furniture, accessories, and plants to further reduce the cost.