We figured out that overhead power lines would prevent it from being lifted in by a crane, so we decided to have it assembled onsite. Then the county decided -- after full approvals -- it needed a concrete foundation. We asked how to do that when the backyard already had a concrete foundation. Building department said pour it on top of the existing foundation.
I've mentally blocked my memory of the other ways the county came up with to make it hard to place this cuboid shape in my yard, but each time added another $10K. And the end result, other than being a foot off the ground because of the duplicate foundation, was nothing more than the $30K structure I originally bought. I can't point to where the extra $50K went and say at least I got value from it.
Like all home construction or remodeling, each misstep was outrageous, but tolerable because it was surely the last hiccup before completion. Only later do you realize it's Zeno's Paradox and you're always halfway from the finish line.
Overall the price you see on the website is the price for the unit. You need to factor in delivery, upgrades, installation and site design).
As mentioned, it wasn't a cheaper option, but rather a better investment with the quick build and quality control. Our total for the build (with land) was still a savings compare to what is available in our local market.