There are no official free campsites in the immediate Margaret River area. However, you can find some free or low-cost camping options in the surrounding region. One option is the Warren National Park, which is about an hour's drive south of Margaret River. The park offers low-cost, basic campsites with access to the river and surrounding forest. Keep in mind that these sites may have limited facilities and require a self-sufficient setup. Always check local regulations and camping restrictions before setting up camp.