Needed: Ideas for a cheap temporary Floor work surface

Set your jackstands on brake rotors to keep them from sinking. They will give lots of surface area to hold the load and are not so big that you have trouble working between them, I do not recommend pavers or other thin masonry because they are more likely to crack and could dump your car on you. 2 2x8s for floor jack. Used that in my lawn and had no trouble even when it rained.