TS1

TS1 is an Australian designed and built transportable, modular building system which has been used in a variety of applications, most recently as an accommodation dwelling. They boast a number of awards, recycled material use and can be erected in a single day.

The base units cost between $29,000 and $38,000 and have many optional extras from kitchenettes and bathrooms [$3,500 & $6,500] to awnings and decks [$2,000 & $5,500 respectively].

More information is available from their website:

TS1 now

Cheers to Paul K for this one.