Splurged this year and got this when they had their sale. Ultralight Ground Cloth I believe I paid 125$ for it at the time of sale. at the going rate I doubt Id of spent 160$ on it though.
Tyvek is a great Lightweight Ground Cloth. Or if Weight isn't that big of a deal in the past Ive used those think Emergency tarps with the shiny side up. Access Denied
I 100% always sleep on an ultralight cot and never use a ground cloth in my tipis. Going far back, I made a ground cloth from Tyvek and I used 4 very light sod staples (each corner) to hold it down with no wrinkles. That worked nicely.
Tyvek is perfect and cheap. But often times I dont bring it if im going to be setting up when its dry, then I can find a suitable spot where a ground cloth isnt necessary.
I use my nest with 6-8" bathtub sides. I just drop the netting in the bottom. I have long guylines that reach out to the cimarron stakes or I just use the minis. My gaiters laid side by side serve as my dinner table.
my brother has a bearpaw bathtub floor and really likes it.
Going as light as possible everyone sleeps on their own space blanket, not much for puncture resistance though. For a little more weight and protection pieces of tyvek cut to fit the tipi work well or again, an individual piece per person works good, over size it a bit to provide a place to set clothes and gear. I really don't like to have the whole floor be covered, defeats the big advantage of a floorless of being able to walk in with your boots on and cook in the tent without worrying about creating a big mess.
Tyvek. Cheap and multiple uses. I will use it as a floor mainly just to keep the bag dirt and pitch free. When not used as a floor it is still in my pack for use as an emergency shelter or to layout meat when cleaning animals.