The original tree collar from Crate & Barrel has no bottom. It is designed to hide the tree stand inside without adding any height to the tree.
Retails for $69.95
This LAL is from Tractor Supply…. in their livestock section!
Retails for $34.99
If you want to make into a true tree collar, just break out the power tools and cut the bottom out of the tub.
I think it will still look great if you just turn it upside down and use it more like a tree stand.