I like this one. A bit of recycling stuff that otherwise would have made it directly to the landfill. In this case, old roadside billboard advertisements get a second life as high-quality tarps. They are already UV treated and typically are thicker and stronger than the tarps found at the local hardware store.
For a quick price comparison, I tried to find the closest size and thickness. Here goes –
Amazon Tarp Recycled Billboard Tarp
You get the idea. Another neat thing is that you can get some unaturally large sizes like 36′ x 85′! Check it out here.