Other companies out there bundle additional components (more than just the frame). A quick google search turns up DIY kits that includes insulation, floors, walls, etc.
The fuck? 1400sq feet is not a tiny home. That's the size of the house I live in.
Also for barely more than that, you can just get a manufactured home, that comes with walls, power, carpets, insulation, plumbing, cabinets and bathrooms.
These tiny home things are all a joke, they're not cheap, and never have been. It's kinda like these people building container homes. Sure they're cheap to start, then you start putting in all stuff that makes it a house, and lo-and-behold it becomes as expensive as a house.
Here's one for $66k (steel frame only): https://www.homedepot.com/p/Bungalow-Raised-Deck-loft-2-Bedr...
Other companies out there bundle additional components (more than just the frame). A quick google search turns up DIY kits that includes insulation, floors, walls, etc.
Edit: This was actually on HN a couple weeks ago https://news.ycombinator.com/item?id=36209328