The Walking House
What is 10' tall, has six hydraulic legs, and is powered by the wind and solar panels? The prototype pod house built by art collective N55 in Copenhagen, Denmark. With the help of MIT, N55 built the pod over a two-year period at a cost of £30,000. Designers say it provides a solution to the problem of rising water levels as the house can simply walk away from floods. One of the designers says, "This house is not just for travellers but also for anyone interested in a more general way of nomadic living." It won't be long now until the Japanese make Howl's Moving Castle.
My sailboat - made of FRP, 40 years old, a classic with a sound hull and rig - cost less than $5K to buy, and I will have less than $15K in her when she is completely fixed up, including replacement of all wiring, subsystems, etc... She uses solar and wind, and is just fine living off the grid. For ease of access, though, it costs less than $300/month to stay tied up to a marina dock. Mechanical propulsion, when needed, is provided by a small outboard which consumes only 1/4 gallon/hour at full speed. She is capable and able to go nearly anywhere in the world that there is a water depth of 3.5 feet or more. Floods only give her more places to go. ;)
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There are many many hundreds if not thousands of older boats - power and sail - out there which get destroyed or sink due to neglect every year. With some due diligence, anyone can find a very sound vessel to start with, "recycling" in a sense, and living a lifestyle which has a very small 'footprint' of consumables. Why pay $50K for a home as small as a small boat, that can only traverse land (and that, slowly...), and which is absolutely dependent upon the grid?
Of special note is the fact that few marinas will have a true geek/nerd/IT pro in residence. Yet nearly all of them now have office computers, websites, and wireless networks - all things which can benefit from knowledgeable attention. Your skills and knowledge can make the cost of marina living a trivial sum, reducing your "existence tax" even more...
"...there are some things that can beat smartness and foresight. Awkwardness and stupidity can." ~ Mark Twain