Well isn't that what you do when you live, contribute to a community?
As far as a planned communities. I would but generally only with other libertarians. I think for a good planned community you need to have the same fundamental values, as it is sort of a commune. Mennonite history is a good example of planned communities, something old order mennonites, and Amish often times engage in. Of course "a state" owning all property, an I think aside from Texas its not easy to find psuedo allodial title these days, so there is always the risk of governmental control, branding as hostile compounds etc..
Of course it would basically be moving. In regard to most people here you are probably thinking in terms of America, and I can't travel to the US without US attorney general (perhaps office) permission, and further, that is unlikely. IMO I'd go for land in central or south america. I know an absolutely awsome and beautiful place about 20km from Liberia Costa Rica I think would be great. Its in the hills beautiful views abundant plantlife, lots of growing potentials, great year round weather... water might be a challenge. Of course there are cheaper Latin American countries if you can mitigate the governmental issues. Or why not Jamestown II, bad joke.
The other option is inputs into a boat or flotilla. Boat Angel on ebay sold a lot of very low cost boats that could accumulate into very low price structures if properly managed. However the lowest costs would likely come from an eco village of sorts. I'm guessing most people are thinking somewhere in the US. I'm all over beach side, there are massive unpopulated areas on the pacific coast of Mexico also that have beach access, sea life, materials and are fairly close to civilization.
The libertarian thing is essential as it removes the potential of cult controls that are exhibited in commune society. If everyone is equal in an egalitarian society, and everyone owns their own property, equipment etc.. with control over it it stays within the mainstream cult property value. If people are responsible for themselves then there you go. Of course people can cooperate but there is no obligation to, if everyone maintains them-self any surplus is surplus.
Mennonite Society, such as Bees are a good example of how group tasks or emergency tasks can be done.
Mennonites saw Bees as a chance to get together and socialize, they did them because it was fun, work is not work if it is play. Of course there are social issues too; however, more or less its all what people want from it.
I think most Americans will feel at home in America because they would presumably maintain their rights, while if in a foreign country they would be subjected and have limited rights.
Yeah planned communities are great though. I think people are much happier in a stable environment amongst people who share their values.
Check this out though
http://disinfo.com/2013/01/glenn-beck-planning-2-billion-libertarian-commune-in-texas/
not sure what it is about texas,
http://communitybuzz.ic.org/2008/04/24/ron-paul-supporters-to-form-libertarian-community/
I think the cheapest and easiest way to do this is to get land and roll in used RV's.
It would actually be fairly cheap to build a community provided water were available.
Of course creating an economy that connects with the global economy requires goods or services, or a means of acquiring goods.
People collect scrap in some central and south american countries. In the north recycling programs for everything imaginable are being formed under EPA type legislation.
However you'd be suprised how much reusable stuff people throw out, electronics, metals, plastics, etc.. all of it reusable, which is suppose to come before recycling.
Reduce
Reuse
Recycle
Of course plenty of people have income streams.
None the less the economic maxim is there, you must supply in order to be eligible for your needs and demands, although nature provides most everything we as humans need, humans like luxury thus industry exists.
Its easy to build a community but maintaining it requires resource or the willingness to go back to basics or to live off what is free.
There are plenty of books on that.
Resources are global commodities, it actually could require a lot of planning. But it would be remarkably easy should people have sufficient local resources or an income stream.