muslin 9 feet wide, 16 feet long, it is thick and seamless, ready to use and about $100.
normal cloth only 5ft wide, the cost of material plus sewing two pieces together will be around the same price or more expensive, but there is a seam right at the middle, and the cloth is usually thinner. this does not include painting yet.
Normal cloth will do. You can paint it yourself if you want. Those muslin backdrops are usualoly for larger objects like human. Or you can shoot with a chromakey/green backdrop and add in the backdrop in post process later.