I described in my thread http://teakdoor.com/construction-in-...d-so-easy.html (A swimming pool in Thailand – so easy)
an affordable swimming pool 12x3 m I built 12 years ago. Not really by myself as in the previous video - with a help of Thai workers - and they do not work for nothing. So it was for little bit more than $3,000, but really affordable.
And it serves well with minimum maintenance, for my daily long track swimming, surviving two earthquakes when the water run over the edge.