If you want to have nice but inexpensive furniture for your outdoor activity, look for patio chairs or a particular type of chair at secondhand stores or venues. Browse through local garage sales and moving sales, particularly in the middle to upper class neighborhoods near you. Search online stores and marketplaces. Keep your eyes open for discounts particularly at the end of the summer, when many stores and outlets mark down their patio furniture.
When the look of the furniture isn't a priority or when you are looking for a quick fix to outdoor seating, try searching your home to find creative seating options. Plastic milk crates, food storage cans, large rocks, toolboxes, bean bags, mattresses, plastic paint buckets, and camping chairs are excellent seating options. Just add a few cushions or pillows for extra comfort. Ask your neighbors and friends to borrow chairs or similar objects to be used for your outdoor activity.
There are numerous websites and manuals that can help you make a wooden stool, crate or chair. You could also remodel or restore old furniture that you have around your house. It's highly advised to make your own furniture with proper tools, proper instruction, and supervision.