Tyvek or Polycryo (window shrink)...you pick
Common household construction Tyvek- more durable, greater puncture resistance, loud crinkly noise (at first, but goes away with use), heavier, less water resistance- you can buy anywhere (zpacks, tarptent etc etc)
Polycro- Cheaper, Thinner, lighter, quieter, harder to handle, less durable, less puncture resistance, will shrink if exposed to sun for extended periods, more water proof. Can buy on amazon for cheap, but also sold by gossamergear, and maybe MLD.
I've never used the soft structured tyvek before (14XX series)- its a bit more expensive, but lighter than common house hold tyvek. Same issues with weaker water resistance though