Yeah, I've got tarps, I even set them up somewhat usable in wooded areas, didn't like the space it took, although it *can" be set up smaller, but that hurts the space it offers in return...

Fabs

The one on the left there is smaller than you’d think, also you don’t need to buy a  “specific tarp made for this”

You can just buy one of those standard blue ones people use to cover things with. If you do this I would practice setting it up in your back yard/ woods to be sure you’re effective in how you set it up because you’ll need to make sure the water funnels, otherwise it will just pool on top.

Outdoors

On setting up camp in the pouring rain.

The one on the left there is smaller than you’d think, also you don’t need to buy a  “specific tarp made for this” 

You can just buy one of those standard blue ones people use to cover things with. If you do this I would practice setting it up in your back yard/ woods to be sure you’re effective in how you set it up because you’ll need to make sure the water funnels, otherwise it will just pool on top. 