With just a small number of configuration and appearance options, and a fabrication process that includes all finishes, you really are getting a 'prefab' home. It might not be that custom home you've been thinking about since first grade, but a first grader could probably handle the ordering of this puppy.
The weeHouse features studio, one and two bedroom options, with the ability to customize and build a much larger home. The standard options range in price from $70,000 for a 300sf studio to $110,000 for a 650sf two bedroom. These prices don't include bringing the utility hookups to the site or the home's foundation; homeowners and their contractor are responsible for this on-site work. Standard finish and fixture options include Ikea cabinetry and fixtures, and, for a price, the more high-end Duravit sinks, toilets, and tubs.
The 12' modules are built in the factory and trucked to your (future) doorstep. Hire a crane (at ~$250/hr - $500/hr) to position the structure on your foundation, hook up the utilities and you are ready to go! It doesn't get much easier than that. This method is one that other prefabs really should aspire to.
Alchemy Architects offer a number of custom options too, ranging from the ability to design "not too wee" houses or even to site-build a weeHouse.
price: $69,500 - $109,500 for standard models
size: 300sf - 700sf for the standard models
br: studio - 2 bedrooms
how: complete modules shipped to site, placed with crane
timeline: construction stated as 4-12 weeks